City Sightseeing is the World's number one Open-Top bus operator, with sightseeing tours in more than 109 locations carrying well over 16 million passengers per year. It is a global brand which brings together the finest operators of panoramic tours from around the world under one recognizable banner on a RED BUS that ensures a tour of quality and excellence. The tours provide the perfect way to see all the best sights and attractions in each city. The unique 24 hour ticket over 2 days, offering the "Hop On Hop Off" facility, means that people can explore each destination at their own leisure.