The celebrated eyesore created by starry-eyed sweethearts.

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

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

Vast stretch of tide-pools with a unique Moroccan charm.

Cliffside houses provide a spectacular view from their perch above the valley.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

An ancient Egyptian temple in the middle of Madrid, Spain.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

The earliest known map to show America, discovered by accident at a Paris bookshop.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

Commonly acknowledged as the only public monument to the Devil himself.