America's Most Wanted's set resides in this tribute to the history of crime and punishment.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

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

The hippo that stands on this university campus was once a drunken flea market purchase.

People escaping slavery may have hidden inside a corpse vault.

This hidden treasure provides a charming access point along the south side of Baker Park.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The site of the climactic scene from the classic horror film is now a historic landmark.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

The span is crooked and made from two older recycled bridges.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

The site of the one and only battle of Lord Dunmore's War.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

This unique structure is the only one of its kind in Virginia.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

Winding country roads in eastern West Virginia lead to an extraordinary place populated by fiberglass giants.