The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

These spooky and unusual stone formations create an underworldly landscape.

This black shoreline is made up of exploded lava particles.

A Hawaiian stairway to heaven—that you can't climb.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

A small town Romanian cemetery filled with darkly humorous gravestones.

This massive underground salt mine now holds a sci-fi theme park in its depths.

South Korea's love of the silly photograph is on full display at this goofy collection of trompe l'oeil paintings.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

This spacecraft-shaped water tower is only a part of the mysterious UFO mania in this Brazilian town.

At high tide, the base of the lighthouse covers practically every inch of the island.

This 15th century pub is one of only two pubs in England situated on consecrated ground.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The largest greenhouse in the world is home to over one million types of plants.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

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

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

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

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.