Big Bus Tours, the largest operator of open-top sightseeing tours in the world, currently has more than 150 buses worldwide and offers sightseeing tours in 20 cities across three continents. The Big Bus philosophy is to ‘think global and act local’. “Understanding each city, its character and culture as well as its landmarks is key to our success” commented Pat Waterman, CEO. “We aim to provide exceptional levels of service and a unique sightseeing experience to the millions of customers we receive” every year. This obligation to provide a good experience drives Big bus tours to innovate and develop new products and offers. The United States is the country with the largest number of cities with Big Bus Tours service. Buses travel near major landmarks around the town or city it tours. In large cities, buses go on more than one route and some variants of the ride include travelling by boat in some cities .