From a network of tunnels run by a drug lord named Bruce Lee, to The canal settlements of Amsterdam.\r
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More of my videos:\r
10 Best Hidden Rooms Ever ► \r
10 Most Haunted Hospitals ► \r
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Legal\r
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Music credits: Rites\r
by Kevin MacLeod (incompetech.com) \r
Licensed under Creative Commons: By Attribution 3.0\r
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