This Colorado fire station has been in continuous operation for more than a century.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

A downtown park built on top of unclaimed graves.

One of three remaining theatres in the United States created in the Art Deco Mayan Revival style.

The final resting place of a 19th-century gold prospector and convicted cannibal.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

Mile-long cave system near Great Smoky Mountains.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

A mysterious castle built as a monument to lost love.

An underwater city for the dead.

This historical swimming pool near Miami is emptied and refilled each day with naturally filtered water.

Over 120,000 curious objects that have shaped our modern world.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Former villa and estate of James Deering developed to preserve native tropical forests.

Shaped like a big top tent, this memorial honors the victims of a terrible train wreck.