A once extravagant mansion, now reduced to ruin.

This remote location of this Moorish stronghold means it doesn’t attract many tourists—and that it still has the aura of fear and bravery of the 1300s.

These ruins disappear beneath the waves every winter.

This magnificent arch is all that remains of a former smelt mill.

The ruins of a 19th-century corn mill are haunted by a malevolent cave-dwelling spirit.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

Now in ruins, this abbey was the home of Tironensian monks for more than 400 years.

The crumbling remains of a once-grand building.

It's unclear what caused the fire that led to this opulent hotel's demise.

Built in the 16th century, the tower is now in ruins.

The ruins of a 17th-century lodge on a grand estate are being slowly restored to their former glory.

An abandoned Indian-inspired mansion.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

This picturesque abandoned home is rumored to be a spite house.

This remote Moravian mission brought Christianity—as well as devastation—to the Inuit people.

Walrus skulls and narwhal bones were found here while excavating a 900-year old church.

This abandoned five-star hotel is now a five-star urban exploration destination.

This abandoned radar station from the Cold War era now only broadcasts a seriously ominous air of isolation.

Abandoned Italianate architecture on the coast of Maine.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

The ruins of an abandoned crematorium haunt an eerie deserted German cemetery.

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.