From the Annals of the Vandals – In 1889, H.S. Barber carved his name in Devil’s Sinkhole near Rocksprings. The 350 foot deep sinkhole was first encountered by settlers years before, but Barber was the first known person to explore the cave.  The vertical cavern is the largest known single-chamber cavern in Texas. The cave opening is a shaft approximately 50 feet wide with a 140 foot vertical drop into the cavern. The shaft widens to a diameter of over 320 feet and reaches a total depth of over 350 feet. The cave is home  to more than three million Mexican free-tail bats.  It is now part of the Devil’s Sinkhole State Natural Area and can be visited by making advanced reservations.