You’ve probably spent your travel life doing it the easy way: land somewhere, wander toward the big sight, buy a ticket at the window, and walk in. Across much of Europe, that habit now gets you a polite shrug and a closed door.
Famous European destinations you can’t just show up at are multiplying. Fragile frescoes, overcrowded museums, sacred islands, and even a tomato fight now require reservations, timed slots, permits, or capped numbers. Some sell out weeks ahead. One admits only a handful of people each week.
The good news is that almost every one of these places rewards a little planning. Know which sights need a booking before you buy your flight, and you can lock in the experiences you care about while keeping the rest of your trip loose and spontaneous.
Anne Frank House, Amsterdam
The Anne Frank House sells all tickets online, releasing them about six weeks in advance. There’s no ticket desk at the door, so if you turn up on the Prinsengracht without a booking, you’ll only see the outside of the building.
Slots disappear fast, especially in spring and summer, so set a reminder for the release date and book as soon as your day opens. Inside, you’ll climb behind the movable bookcase into the Secret Annex, where Anne and seven others hid for over two years. The rooms are narrow and steep. The self-guided visit takes roughly an hour, with an audio guide.
Kilmainham Gaol, Dublin
You can enter Kilmainham Gaol only on a guided tour, and you need to book ahead. Guides lead small groups through the former prison, keeping the corridors from overflowing and preserving its quiet, heavy atmosphere.
That atmosphere comes from the place’s history. Leaders of the 1916 Easter Rising were held and executed here, and the tour includes the stonebreakers’ yard where they died. You’ll also see the vast Victorian east wing, familiar from films like In the Name of the Father. Tours last about an hour, plus time in the museum exhibition. Same-day availability in summer is rare.
The Last Supper, Milan
Leonardo da Vinci’s Last Supper requires a reservation, full stop. The mural covers a wall of the refectory at Santa Maria delle Grazie, and visitors enter in small groups for just 15 minutes.
Before you reach the painting, you’ll pass through climate-controlled chambers that filter dust and humidity. The mural has been deteriorating almost since Leonardo finished it around 1498. Tickets come out in batches and sell out quickly, so check the official booking calendar well before your trip. If official slots are gone, guided tours that include entry are your fallback, at a higher price.
Auschwitz-Birkenau, Poland
You need to book a personalized pass through the Auschwitz-Birkenau Memorial’s online reservation system. Each pass carries your name, and staff can check it against your ID, so bring your passport.
The site sits near the town of Oświęcim, about an hour and a half from Kraków. A full visit covers two parts: Auschwitz I, with its brick barracks and exhibitions, and Birkenau, roughly 3 kilometers away. A free shuttle connects the two. Plan on at least three and a half hours. During busy months, the museum reserves mid-day entry for guided groups, so independent visitors should book an early or late slot.
Keukenhof, Netherlands
Keukenhof sells admission for a specific date and arrival time, so you need a ticket before you show up in Lisse. The gardens open for only about eight weeks each spring, roughly from late March to mid-May. That short window draws huge crowds.
Around seven million bulbs bloom across the park, with tulips peaking in mid- to late April, depending on the weather. You can buy combination tickets that bundle entry with a bus from Amsterdam, Schiphol, or Leiden, saving you the parking hassle. Book an opening-time slot on a weekday for calmer paths and the best light on the flower beds.
Warner Bros. Studio Tour London – The Making of Harry Potter
Book the Harry Potter studio tour before you leave home. Standard admission requires an advance, timed ticket. The tour is in Leavesden, northwest of London, on the lot where all eight films were made.
Getting there is easy: take a train to Watford Junction, then the dedicated shuttle bus. You’ll need to show your tour ticket to board. Inside, you’ll walk through the Great Hall, Diagon Alley, Platform 9¾ with the Hogwarts Express, and the giant Hogwarts castle model. Most people spend three to four hours. School holidays and the seasonal Hogwarts in the Snow event sell out months ahead.
Scrovegni Chapel, Padua
You can see Giotto’s frescoes in the Scrovegni Chapel only with a reservation, and your time in front of them lasts just 15 minutes. Painted around 1305, the cycle covers the entire interior with scenes from the lives of Mary and Christ beneath a deep blue, star-studded vault.
Before you enter, you’ll wait about 15 minutes in an air-conditioned room. It stabilizes the humidity your group brings in, while a short film explains what you’re about to see. Arrive early, since late arrivals lose their slot. In some seasons, the chapel offers evening double slots, giving you a full 30 minutes inside.
Vasari Corridor, Florence
The Vasari Corridor admits visitors in small reserved groups, capped at 25 people. Built in 1565 for the Medici, this elevated passageway runs from the Uffizi Gallery across the Ponte Vecchio to the Pitti Palace, letting the grand dukes cross the city unseen.
After a long restoration, the corridor reopened in late 2024 with a stripped-back look that puts the architecture and river views first. Book through the Uffizi Galleries, and keep in mind that slots fill quickly in high season. Small windows above the Ponte Vecchio’s jewelry shops offer a rare look down on one of Florence’s busiest spots.
Mount Athos, Greece
To set foot on Mount Athos, you need a special entry permit called a diamonitirion. The authorities issue only a limited number each day. The peninsula is a self-governing monastic community of 20 monasteries, and only men can visit.
Apply through the Pilgrims’ Bureau. Non-Orthodox visitors get a much smaller daily quota, so request your date months ahead. You’ll collect the permit in Ouranoupoli and travel in by ferry, since no road connects the peninsula to the mainland. A standard permit covers a stay of up to four days. You’ll also need to arrange in advance to spend the nights as a guest in monasteries.
Skellig Michael, Ireland
You can land on Skellig Michael only with a boat run by a licensed operator, and daily visitor numbers are strictly limited. The rocky island lies about 12 kilometers off the coast of County Kerry, with most boats leaving from Portmagee.
Landing trips run in summer, roughly from mid-May through September. Atlantic swells often cancel sailings, so build a spare day or two into your plans. Once ashore, you’ll climb over 600 uneven stone steps to a sixth-century monastery of beehive huts. Star Wars fans will recognize it as Luke Skywalker’s hideout, which has only pushed demand higher.
Original Altamira Cave, Spain
Only five people a week enter the original Altamira Cave, selected from a historic waiting list. The Cantabrian cave holds Paleolithic paintings of bison and other animals dating back more than 14,000 years. Human breath and body heat threaten them.
Those lucky few put on protective clothing and spend a short, closely supervised time inside. Everyone else can visit the Museo de Altamira next door, which houses the Neocave, a meticulous replica of the ceiling paintings. You can buy museum tickets online or on arrival. The replica gives you a close, unhurried look at art you’ll almost certainly never see in person.
The Reichstag Dome, Berlin
Register online and wait for confirmation before you enter the Reichstag dome. Entry is free. The booking requires the names and birth dates of everyone in your party, and you’ll need ID on the day.
Expect airport-style security at the entrance. This is the working home of the German parliament, after all. Up top, Norman Foster’s glass dome spirals upward around a ramp, and a free audio guide points out Berlin landmarks as you climb. Book a few weeks ahead for sunset slots. If you’re short on time, a nearby service center sometimes offers same-day registration when space remains.
CÃes Islands, Galicia
In summer, you need authorization from the Galician regional government before you can even buy a ferry ticket to the CÃes Islands. Visitor numbers are capped during the main season, roughly from mid-May to mid-September, as well as during Easter week.
Once your authorization is approved, book a boat from Vigo, Cangas, or Baiona. The islands are part of the Atlantic Islands of Galicia National Park, and Rodas beach, with its white sand and turquoise water, is the star attraction. Bring your own food and take your trash back with you. Book campsite stays in advance, too.
Big Ben, London
To get inside Elizabeth Tower, join a small guided tour and book in advance. The tower houses the Great Bell known as Big Ben. It reopened to visitors after a major restoration finished in 2022.
There’s no lift, so you’ll climb 334 spiral steps to reach the belfry. Along the way, you’ll see the back of the clock dials and the Victorian mechanism, then stand beside Big Ben as it strikes the hour. Tours have a minimum age of 11 and run in very small groups. Release dates draw heavy demand, so check the Parliament website and book as soon as new dates appear.
La Tomatina, Buñol, Spain
La Tomatina caps attendance, so you’ll need a ticket to enter the event area. The tomato fight takes place on the last Wednesday of August in Buñol, near Valencia. It lasts about an hour and draws around 20,000 participants.
Trucks roll through the narrow streets, dumping overripe tomatoes, and everyone pelts everyone. Wear clothes you’ll throw away, closed shoes with grip, and swim goggles. Squash tomatoes before throwing them to avoid hurting anyone. Tickets go on sale months ahead, and many visitors book packages that include transport from Valencia, since local accommodation is scarce.
Paris Catacombs, Paris
The Paris Catacombs sell tickets online only, so arriving at Denfert-Rochereau without one gets you nowhere. Underground, about 1.5 kilometers of tunnels hold the remains of roughly six million Parisians, moved from overflowing cemeteries in the late 18th century.
You’ll walk 131 steps down and 112 back up, with no lift. Temperatures stay around 14°C year-round, so bring a layer. Plan for about an hour. Timed slots come out a few days to a few weeks ahead, and evening and weekend times go first. You’ll exit several blocks from the entrance, on Rue Rémy Dumoncel.
Via dell’Amore, Cinque Terre, Italy
Walking the Via dell’Amore now requires a reservation for a specific 30-minute entry window. The path’s capacity is limited to protect it. The cliffside walkway links Riomaggiore and Manarola, two of the Cinque Terre’s five villages.
A 2012 landslide closed the trail for over a decade, but it reopened after extensive reinforcement work. The route is short, flat, and paved, with sweeping sea views, so it suits nearly any fitness level. Book through the national park’s official channels, and arrive on time for your slot. Pair it with a Cinque Terre Card for train travel along the coast.
Blue Lagoon, Iceland
You need a reservation with a set entry time to visit the Blue Lagoon. Once a day sells out, there’s no walk-up option. The milky-blue geothermal spa sits on the Reykjanes Peninsula, about 20 minutes from KeflavÃk Airport.
Many travelers schedule a visit right after landing or before departing, so those slots go first. Packages vary in what’s included, such as towels, drinks, and silica mud masks, so compare before booking. Check the lagoon’s website close to your date, too. Volcanic activity near GrindavÃk has caused temporary closures in recent years.
Van Gogh Museum, Amsterdam
Buy Van Gogh Museum tickets online, since each ticket comes with a timed entry slot and the museum doesn’t offer regular walk-up admission. On Museumplein, it holds the world’s largest Van Gogh collection, including Sunflowers, The Potato Eaters, and The Bedroom.
The galleries trace his short career, from dark early Dutch works to the vivid canvases he painted in Arles and Saint-Rémy. Weekends and holidays can sell out days ahead, so book the first morning slot or a Friday evening, when the museum stays open later. You can pair it with the Rijksmuseum across the square on the same day.