A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Architectureal fantasy quarter of Rome.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Go inside to really appreciate this 500-year-old technological masterpiece.

100 year tradition of fist fights, marked by marble footsteps.

The final resting place for the remains of 143 Habsburg royalty.

Baroque celebration of the end of the Great Plague of Vienna.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The world's largest reflecting pool is just two centimeters deep.

Historic medieval fortified city in southwest France.

Lady Liberty's original designer installed a little clone in this French fountain.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This bridge was constructed from the rubble of the infamous Bastille.

A mechanized clock where a man fights off a dragon, crab, and rooster.

The celebrated eyesore created by starry-eyed sweethearts.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

It houses the remains of a 17th-century version of the Titanic.