Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This series of Scottish caves has no clear purpose other than baffling historians.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

This spa theme park lets its guests take a dip in pools of coffee, wine, or ramen broth.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A house filled to the brim with oddities and curiosities.

The trials and tribulations of marking Poe's grave.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

This Los Angeles animation studio is keeping the wonder of stop motion puppetry alive.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Quite simply the largest tree in the world (by volume).

Make your reservation to have coffee with some kitties.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Tubing through a cave lit with glowworms is a magical underground experience.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A 20-meter (65-foot) robot towers over Tokyo Bay.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The second oldest continuously operating bar in Louisiana.