The Beer Can House in Houston in 2011. It's estimated that more than 50,000 beer cans were used to cover the entire house. Bill Rand/Flickr hide caption

itoggle caption Bill Rand/Flickr

Mild-mannered teacher by day, masked superhero by night, the Burka Avenger fights corruption and oppression, and aims to empower the girls of Pakistan. Unicorn Black Studios hide caption

itoggle caption Unicorn Black Studios

British rockers Led Zeppelin pose in front of their private plane, dubbed "The Starship," in 1973. Hulton Archive/Getty Images hide caption

itoggle caption Hulton Archive/Getty Images

It was at the Catskills' Avon Lodge in 1942 that comic and actor Sid Caesar would meet Florence Levy, a kids' counselor, niece of the owner and later Caesar's much-adored wife of nearly seven decades. "I thought he would be just a nice boyfriend for the summer," she told a California newspaper not long before her death in 2010. International Film Circuit hide caption

itoggle caption International Film Circuit

Human sexuality researchers William Masters and Virginia Johnson Masters, shown in San Francisco in 1972. AP hide caption

itoggle caption AP