The last bastion of Roman presence north of the Alps looms over a German town.

This 600-year-old home seems to defy physics.

Legendary site where an evil bishop was devoured by rodents.

This tremendous timepiece was once the largest cuckoo clock in the world.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

This might just be the TARDIS of bookstores.

America's first serial killer rests in anonymity.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

The humble gravesite of the man who failed to cash in on his Pepsi-cola goldmine.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

One of the last active volcanoes on the Eastern seaboard.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

The final home of the most famous horse of the American Civil War.

The oddly shaped, steam-spewing building is now an art studio and gallery.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

A quintet of history museums make this Virginia graveyard as much a resting place for funereal history as it is for people.