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13 amazing sinkholes

By: Laura Moss on Oct. 6, 2010, 11:22 a.m.
Devil's Den sinkhole Florida

Photo: Wikimedia Commons

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Devil's Den

Devil’s Den is a fern-draped sinkhole in Williston, Fla., that is fed by underground springs. The water averages 72 degrees Fahrenheit, and on cold winter mornings, steam can be seen rising from the ground — thus, early settlers named the pit Devil’s Den.

The sinkhole’s clear, warm water makes it a popular diving and snorkeling site, and visitors to the cave can see ancient rock formations, stalactites and fossil beds.