This piece originally appeared on TravelandLeisure.com.
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.