Working under the aegis of the National Park Service's Heritage Preservation program, the goals of the American Battlefield Protection Program are "to protect battlefields and sites associated with armed conflicts that influenced the course of our history" and "to raise awareness of the importance of preserving battlefields." To that end, the NPS developed this site which collects a host of...

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...

Chartered by the United States Congress over fifty years ago, the National Trust for Historic Preservation is a private, nonprofit organization which was formed in order "to encourage public participation in the preservation of sites, buildings, and objects significant in American history." Since that time, the National Trust has worked to preserve a host of structures that have some importance to...

Have you ever walked by a busy street corner and wondered what was there 20, 30, 50, or 60 years ago? If you have, the WhatWasThere site may be able to provide you with answers. The premise of the site is simple: the team at WhatWasThere has provided a platform where anyone can upload a photograph with two tags (location and year) so that others can learn more about the built environment. Visitors...