There are 6 miles of tunnels below Houston's downtown; most of the system is private property. Along those corridors are restaurants, shops, and businesses of all varieties. You can get a map of the tunnels from the city's visitor center or you can take a guided tour if you schedule it in advance.

Copyright: Excerpted from Frommer's Texas, 4th Edition, (c) 2008, Wiley Publishing, Inc.

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