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

An underground city of salt.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Ruins of a German Castle on top of a towering stone pillar.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The "Prussian Versailles" that is as glorious today as when it was built.

Real bones which are said to have belonged to a Polish dragon.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Oldest surviving example of a Dutch saltbox frame house in America.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A semi-scholarly approach to sex.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

An artist's cute bronze subway sculptures belie his violent artistic past.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.