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

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

400-year-old garden, restored to beauty.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Russian Orthodox church built on an Antarctic island.

For over 300 years this little carving has been the city’s good luck charm.

Once the home of a hermetic monk, this cave now houses a small church.

A 20th-century picture show in 3-D.

Lost subway station nestled beneath Toronto's busy commuter line.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

Where beautiful signs live on forever.

An ancient city exhumed from the depths of the ocean.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Malaysian fireflies create a dazzling display as thousands light up in unison.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

This former insane asylum now holds a pathological anatomy museum.

The central mosque of this Mali town is entirely built from mud.

Before the electric telegraph, a chain of stone towers carried messages across France.

A castle built by an eccentric medieval enthusiast in rural Ohio.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

Abandoned bridge hidden deep in the San Gabriel Mountains.

A geological bull's-eye visible from outer space.

This golden temple is surrounded by hundreds of stone tablets that comprise the "world's largest book."