This former luxury resort in Kaua'i is now an abandoned relic.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

A 12th-century church that houses a dark creature.

The trials and tribulations of marking Poe's grave.

Legend has it that a Dutch fisherman lost control of his Shetland pony and tumbled from this cliff.

This audio art installation pays tribute to the weather and unique linguistic history of the archipelago.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A showcase of canine neckwear spanning five centuries of doggie fashion and function.

This mysterious and creepy location instills a strong sense of foreboding in all visitors.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

This subterranean necropolis holds three floors of antler-dug grave caves.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Dynastic Home of the De Piro Family.

A centuries-old forgotten underworld lies beneath Malta.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

These temples are among the oldest free-standing stone buildings in the world.

A monument at the site of a decisive battle in the First English Civil War.

The first German gnome who popularized the garden decoration.

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

This church is considered the largest and most complete Saxon church in England.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.