Visit top U.S. historical spots

POSTED: 01:50 PM MDT Apr 10, 2012    UPDATED: 08:21 AM MDT Aug 30, 2013 
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Summer is a great time to travel and a perfect time to catch up on some great U.S. history. The history of the U.S. is as unique as the many sites marking its growth. Find out where visitors can experience America's proud heritage firsthand.