The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

One of the only single-person private gravesites in New York City.

People escaping slavery may have hidden inside a corpse vault.

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

A historic cemetery filled with quirky faux wood art and unique tombstones.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

A natural swimming pool in the middle of the Carite Forest.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The world's second largest single-dish radio telescope, once used to contact E.T.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

La Cara del Indio honors the Taíno chief who fought bravely against the Spanish invasion of Puerto Rico.

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

The short hike is worth the stunning views and crystal blue waters of a secluded beach.

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

The highest peak in Puerto Rico is home to a rare fern that can only be found on six trees at its summit.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

Years of neglect and nature took a toll on this 19th-century lighthouse.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.