The shell of a medieval fortress offers commanding views of the area it once protected.

A historic ruin just 20 feet away from a busy highway onramp.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Back in the day everyone who was anyone played this historic western theater.

The world's tallest bridge is also possibly the most elegant.

A preserved factory in the "Home of the Carrousel" is now a museum dedicated to the classic wooden ride.

No one seems to know who suffered the disappointment at this particular place.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

Ruins of a once-prized railroad station in New York.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The longest fence in the world stretches over 3,000 miles to keep the dingoes out.

"...I guess that was your accomplice in the wood chipper?"

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The "first cat," "first dog," and even a presidential pygmy hippo all get their due in this museum.

America's first public mental health facility.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The "Skinny House" is made from scrap, salvage, and a neighbor’s kindness.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.