Natural Bridge Caverns, Inc.

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San Antonio Underground
Just north of—and a little below—San Antonio are the Natural Bridge Caverns, whose miles of underground passages can be explored in a variety of tours. Lantern tours offer eerie illuminations of the stones, while "Adventure Tours" require rappelling, crawling, and climbing. For those who prefer to seek adventure aboveground, the "Canopy Challenge" straps you into a zipline high above Texas hill country. The "Bracken Bat Flight" experience conquers one last phobia: a few miles from the caverns, visitors observe thousands of bats as they emerge from their cave at dusk.

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