The world’s leading sightseeing tour company City Sightseeing is the world’s leading global brand for sightseeing tours on open-top double-decker buses, boats and guided walking tours, as well as a marketplace for the most exciting attractions in the world's top destinations. For millions of travellers each year, the City Sightseeing brand represents the best way to get to know a city through hop-on hop-off tours, river or waterfront tours, or guided walking tours of the most emblematic sites in more than 100 cities on 6 continents.