Historypin is "a global community collaborating around history," and they have successfully "pinned down" over 281 thousand items to various locations around the world. Over 1,400 institutions and 50 thousand visitors have participated thus far. It's a remarkable experiment in community mapping of everything from Hurricane Sandy to sharing memories of the Queen's visits to foreign lands. Visitors can click on the Map icon to look around by place, date, or subject and it's a fun way to browse around the world through a kaleidoscope of buildings, memories, experiences, and so on. Moving on, the Tours and Collections area contains featured tours of mansions in New York City's Upper East Side, historic postcards of California, and the architecture of Bath.