This article originally appeared on Travel + Leisure.
Between landmarks, historic sites, and museums, there’s no shortage of places in the world to take a tour. The real question is: which spot is the most popular for a guided excursion? According to the mobile travel app Viator, Vatican City is the No. 1 attraction, followed by nearby sights like the Coliseum in Rome.
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The company looked at the number of users utilizing their app to book tours to determine the 10 most popular in 2016. While the Sistine Chapel and Hop-On Hop-Off Sightseeing in Rome both topped the list, other attractions around the world made the cut as well.
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The Moulin Rouge in Paris, a Grand Canyon and Hoover Dam day trip from Las Vegas, Stonehenge and Bath in Britain, Tuscany in One Day, Tokyo’s Robot Cabaret, and a Mt. Fuji Bullet Train excursion were on the list. The release shares more info: “Android users round out their top 10 favorite things to book on the App with Burj Khalifa ‘At the Top’ tickets, a tour of Murano and Torcello from Venice, a Hop-On Hop-Off tour of San Francisco, and the popular New York City Explorer Pass.”
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The app also revealed some of the more unexpected tours travelers are booking this year. A Top Gun and Air Combat Experience in San Diego is another popular attraction gaining some attention, as well as an Elvis wedding at the Graceland Wedding Chapel and a Ferrari sports car experience in Nice, France.