"Holy Wisdom" overlooks the city that became its namesake.

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

A vast Communist-era exhibition space in the Bulgarian capital.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This cemetery features modernist statues as strange as its name.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

These unique markers designate the route American forces took during the Liberation of France.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

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

This emotive sculpture was originally created for the 1878 World's Fair.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The celebrated eyesore created by starry-eyed sweethearts.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.