A unique seaside cave where Aleister Crowley faked his own death.

This oddly shaped church resembles a rocket.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

The world's oldest bookshop still in operation.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

One of the largest Roman settlements in Portugal.

An honorary saint of the people, Maria Adelaide became an incorrupt corpse, the clothes intact, exhaling “a strong scent of roses.”

The stunning interior of this Gothic church is covered in ornate gold details.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

The best place in the world to buy tinned fish.

A 30-acre garden inspired by the principles of modern physics.

A proto micro-nation sometimes populated by artists, surrounded on all sides by a Utah most barren.

A deserted hodgepodge of experimental structures designed by nearby university students.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

An abandoned outdoor movie theater in the Sinai desert.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Abandoned village in Sicily built during the agricultural reforms of Mussolini.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

A community of collapsing homes more than a mile out from the Florida coast.