An unfinished rail tunnel that has since been used to house cheese and bats.

A historic blockhouse and trading post give a glimpse into the early colonial history of South Carolina.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

Designed by famed architect Horace King.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.