Visible below the waves are memorials to the city's Gold Rush dead.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

No one knows who built this strange cave of worship or exactly why.

Moss and stone turn this waterfall into an otherworldly liquid veil.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

The world's largest maze is a nature park with nearly 200 decision points.

Hans Christian Andersen for the postmodern world.

A natural wonder in south Denmark.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

This sublime architectural marvel is a rare example of an expressionist church.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

A public display of random paleontology.

From buck blood to Theriak miracle tonic, this collection of Renaissance chemist's gear look's like a wizard's pantry.

A failed attempt to control drifting sands yielded a gnarled sylvan wonderland.

A golden egg-shaped sauna in the Arctic tundra.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

Preserved "bog person" that is over 2,000 years old.