How much would you pay to live here? Farmville Facebook Photo hide caption

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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