Enormous lake at the bottom of a unique cave system.

A 60-room castle constructed by a horse-racing heir.

More than five miles of underground passageways.

This 1,500-acre development hopes to be the Central Park of the South.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

The final resting place for the remains of 143 Habsburg royalty.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

Stolen goods adorn the organ at Old North Church.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The LSU mascot lived on the college campus in one of the most impressive tiger habitats in the country.

The site of Paul Revere's historic two lantern warning.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

One person's lost luggage is another person's treasure.

Electrical pylon in the shape of Disney's beloved mouse.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The second oldest continuously operating bar in Louisiana.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

These subterranean storage areas hold emergency water reserves.

100 year tradition of fist fights, marked by marble footsteps.

The world's oldest known salt mine.

Daily jousts and dancing barrel makers in Munich's mechanical clock.