Big Bus Tours in 18 Cities Across Three Continents

We ran across Big Bus Tours online, where they describe themselves as "the largest operator of open-top sightseeing tours in the world, providing sightseeing tours in 18 cities across three continents." Take a look to see if a city you are visiting soon is on their list.

This is not an ad, just general travel info. We ourselves have never been on one of these buses and so cannot speak from personal experience.