Dead Man's Hole
Discovered in 1821 by Ferdinand Leuders, a bug guy, observing nocturnal insects. It's 7 feet in diameter and is about 15 stories deep.
After the civil war, the South was not a safe place for those damn Yankees. Especially the ones trying to take advantage of a defeated nation. It's said the Union sympathizers were either killed on the spot, or given a "fair" trial then killed and tossed in the hole. It's thought that 17 bodies are resting at the bottom of Dead Man's Hole.
They've since covered the hole with a metal slab, with a round hole to look down into the darkness. Pity, would be a great chance to drop a drone down there.
Instructions to Dead Man's Hole is as follows...I-35 exits 230 or 231. Drive west on Hwy 71 for 40 miles, then turn right onto Hwy 401/Shovel Mountain Rd (If you reach the highway interchange for US Hwy 281 you've gone 1.5 miles too far). Drive north on Shovel Mountain Rd for two miles. You'll see the unpaved road leading to the Hole on the right.