Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

Pagan monument converted to Christianity with the population.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Perhaps the most spectacular grotto along the Algarve coastline.

This star-shaped military outpost is now simply trying to protect itself from neglect.

The corpse bride of Portugal.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Gigantic water vessel, permanently grounded in Southern Albania.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

The only museum with its curator—and her pets—buried inside.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Two stone columns flank the grand Venice square, but there were supposed to be three.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

100 year tradition of fist fights, marked by marble footsteps.

The plague quarantine island home to the alleged "Vampire of Venice."

Venice's "Island of the Mad."

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.