The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

A relic of FDR's brief foray into utopian urban planning.

A quick journey through the history of Annapolis.

A historic Black graveyard hidden in the parking lot of one of America's largest malls.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

One of the Treasury Building's original columns now sits as a garden monument in the middle of a busy military base.

Allegedly haunted by Walt Disney himself, this inconspicuous lamp is always kept lit in his honor.

A small museum celebrating the fiberglass giants that are icons of America's highways.

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

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

The first newspaper printed by an expeditionary force was published in this colonial mansion.

The site of the largest mass execution in Rhode Island history, haunted by the ghosts of hanged pirates.

The final resting place of the famous Rhode Island lighthouse keeper who heroically saved dozens of people from drowning.

The oldest still-operating tavern in the United States was once owned by a pirate.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

This memorial honors five journalists who were killed in a mass shooting in 2018, and affirms the importance of the first amendment.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

This steep-walled ravine contains animal-shaped formations made from sandstone.

This colorful monument commemorates a little-known story from the life of Abraham Lincoln.

After the comedian dissed a Connecticut town on his show, they named a sewage treatment plant after him.

This 17th-century place of worship still celebrates holidays in the traditional Swedish fashion.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.