Original London Sightseeing Tour Company, London

You have probably seen these hop-on, hop-off open air, double-decker buses zooming around London. Now celebrating 50 years of toting tourists around the capital, you can jump on and off the tour whenever you see something you'd like to explore further. Lasting approximately two hours, the tours are a great introduction to the city. The majority of the tours are offered in several languages - some offer live commentary, while others are pre-recorded. On sunny days, you can get a great tan from the top of the bus, but watch out for London's temperamental weather. Call for information on stops and the different tours.