This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Its buzzing collection honors vibrator history.

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

One of the oldest medical collections in Europe focusing on rare surgical instruments.

A museum dedicated to the history and exploration of both popular music and science fiction.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The world's only museum devoted to the wonders of fluorescence.

World's first "penitentiary," meant to be humane, drove men insane.

World's largest collection of serial killer artwork and other macabre exhibits.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

One of the oldest seagoing boats in the world can be found at the Dover Museum.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

Dispersed across 45-acres, 39 structures house a massive collection celebrating American Folk Art.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A house carved into a rock in the 1940s.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

The center of the only hemisphere that awards visitors with a commemorative coin.

Moss-covered sculptures fill this small Brazilian gorge.

This doorless 20th-century elevator doesn't stop or slow down.

Naked scientists race around the pole in the frigid cold to try to join Antarctica's exclusive 300 Club.