The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

One of only two commuter aerial tramways in the United States.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A modernist landscape of water and sci-fi concrete.

Famously misunderstood wonder of the ancient world

An underwater city for the dead.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Enormous lake at the bottom of a unique cave system.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Elevated freight railway turned wildly successful urban park.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The North Carolina grounds are leased in perpetuity to the British Commonwealth for as long as the WWII sailors are buried there.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

Art Deco urban decay at this historical building.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

Ruins of an American Civil War iron forge still survive today.

A mailbox that saved a nature reserve.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

An eerily abandoned stone tower is all that remains of a demolished dam on Cape Fear River.