Some of history’s greatest secrets are hidden in the world’s most treacherous corners, unforgiving locations that are inaccessible to all but a few. In Travel Channel’s all-new series “Code of the Wild,” premiering on Tuesday, August 6 at 10 p.m. ET/PT, brothers Chris and Casey Keefer – extreme adventurers turned wilderness private eyes – tackle rugged territory that most wouldn’t dare, determined to track down the truth behind baffling mysteries.

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TravelChannel.com takes you on a trip to Puerto Rico to explore its one national park - San Juan National Historic Site.