Tivoli Gardens, one of the world's oldest amusement parks, has been a landmark in Copenhagen, Denmark, since the middle of the 19th century. It remains hugely popular, particularly on summer nights.
Courtesy of Tivoli
Bill Gates, co-founder of the the Bill & Melinda Gates Foundation, checks out a toilet demo at the Reinvent the Toilet Fair in Seattle, Wash. The festival featured prototypes of high-tech toilets developed by researchers around the world.
Bill & Melinda Gates Foundation