The heavily-trafficked Schipol International Airport outside Amsterdam has begun offering city tours to travelers with layovers longer than 4 hours aboard the Floating Dutchman, an amphibious boat.
The Dutchman looks like a normal bus until it drives straight into one of Amsterdam's canals and it's rotors kick into gear, at which point it looks like the world's least efficient motorboat.
After about 45 minutes, the bus wades back out of the water and becomes an automobile once more. It's like watching evolution in fast forward.
Airlinetrends.com reports that busy international hubs across the globe are making more and more of an effort to keep waiting fliers entertained and provide very-short term visitors with opportunities to spend money locally. Turkish Airlines offers similar tours in Istanbul and the StarLine Tour company offers a similar, if tackier, experience in Los Angeles.