Aug. 28, 1963: Hundreds of thousands of demonstrators walk down Constitution Avenue during the March on Washington for Jobs and Freedom. In his new book Nobody Turn Me Around, Charles Euchner chronicles the peaceful civil rights demonstration though the stories of people who were there. Hulton Archive/Hulton Archive hide caption

itoggle caption Hulton Archive/Hulton Archive

The Gum Wall, Seattle: "It's exactly what it sounds like," says Catherine Price, author of 101 Places Not to See Before You Die. The wall, located under Seattle's Pike Place Market, was ranked as the world's second-most-germy tourist attraction by CNN in 2009. (It was beat out only by Ireland's Blarney Stone, which Price also identifies as a must-not-see.) dustkelly via Flickr hide caption

itoggle caption dustkelly via Flickr

Jack Clark's pulp mystery was inspired by his years of driving customers around Chicago after hours. Courtesy Jack Clark hide caption

itoggle caption Courtesy Jack Clark