The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The world's shortest escalator doesn't seem to have any reason to exist other than to hold a world record.

This frequently-photographed waterfall takes only a short hike to visit.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

The largest of the Fuji Five Lakes is home to an impressive swan population—some real, some with paddles, and one with an observation deck.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Venice's "Island of the Mad."

The plague quarantine island home to the alleged "Vampire of Venice."

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

This museum is rotten with a century of wax medical deformities.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

This small electronics museum is full of whirring, humming, clicking ephemera.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

An alien landscape on the banks of the Aegean Sea.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The largest and most famous wax anatomical collection anywhere in the world.

The beautiful baroque library of the Hapsburg empire.

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