The footprint of a frustrated devil in Munich's Cathedral.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Floating swimming pool within a moored vessel.

This historic stone bridge has an entire neighborhood clinging to its sides.

Super-heavy Nazi architectural experiment.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

When the rain falls, this drain system turns into a musical instrument.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

The fairy tale castle of the "fairy-tale king."

An 11th-century fortress home to one of the most influential royal houses in medieval Europe.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

These Bullet-scarred bunkers are haunting reminders of the Spanish Civil War.

A pastry shop specializing in Sephardic sweets serves historic recipes in Ribadavia’s Jewish quarter.

The legendary bathing site of a Moorish queen is actually part of a Roman fish farm.

A statue of a boy looks up at where the famous rival to the Leaning Tower of Pisa once stood.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

This beautiful spit of land was once the summer playground of the king of Spain.

The building hides in plain sight in Ribadavia's historic Jewish quarter.

The ruins of an ancient Celtiberian town with incredible rock-cut buildings and a Roman aqueduct.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Remnants of the rich history of fish salting in this ancient Mediterranean port town.