Once a giant gingerbread factory, this space now hosts exhibits and workshops on the historic treat.

The people murdered during a 17th-century Norwegian witch hunt have been honored with a pair of stark, modern installations.

A moving memorial to the fallen and missing from WWI trenches.

A beautiful and classically designed villa, with an hourly infestation of monsters.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Historic medieval fortified city in southwest France.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

Walk in the footsteps of the gods and straddle two tectonic plates.

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

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

An extravagant monument to an extravagantly unpopular Emperor.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

This lake-bound geographical marker sits at the point where three European countries intersect.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A bus with a butt and biceps to put Olympic athletes to shame.

This modern monument to pagan belief looks like it was transported straight from ancient times.

World's largest cave was only discovered in 1991, and now offers tours to the public.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.