Stone Works Silo's is North America's tallest indoor climbing Gym - http://www.stoneworkssilos.com/
It's located in Carrollton, TX, a couple of miles from Dallas. Know for sure that one of the silo's is 115 feet, read somewhere that some routes go upto 121 feet.
Do note that their outside walls no longer operate due to the new Dart rail coming behind them. Still, pretty impressive walls. Knock on their door, if you're in or around Dallas.
HTH
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