Underground tunnels remain beneath this abandoned mental asylum.

Ruins of a historic medical facility sits eerily by the water.

The kind of mixed-up place that drives archaeologists crazy.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

A reminder to choose water over wine since 1888.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

Once America's longest-manned military fort, now an abandoned hulk.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This charming, hidden guild museum holds some 700 years of crossbow history.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

Drink among marionettes at this pub inside a historic puppet theater.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

Meet the bronze beloved pet to a family of famous peeing statues.

Theme park featuring miniature replicas of European monuments.

Lavish royal estate punctuated with heated greenhouses.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

Sail in for a ’dam good slice.