This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

A derelict bit of transportation infrastructure hidden in the woods.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

This former tuberculosis treatment facility now stands at the center of a public park.

When a guy acquired a free church, he hauled it away piece-by-piece to make it the tasting hall at his vineyard.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

The so-called "world's shortest river" is actually a window into a cave.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

This museum honors the composer of “Swannee Ribber.”

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

A sprawling maze of used books piled from floor to ceiling.

North Central Florida's largest flea market and a weekend roadtripper's dream.

Over 12,500 words are scrawled across each room of this historic plantation house and no one knows why.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

Arrr! The most authentic collection of pirate artifacts in the world... matey.

St. Augustine's record-setting narrow street was designed to protect against pirates.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

A lion given to the prime minister somehow got stuffed and sent to Florida.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Ruins of an old sugar mill sitting quietly next to a park in rural Florida.