There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

This ancient theater was once the home of fierce gladiatorial battles.

One of the world's most complex timepieces.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

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

The world's tallest bridge is also possibly the most elegant.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Historic medieval fortified city in southwest France.

An icy lake tucked among jaw-dropping alpine panoramas.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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.

This historic black and white monastery is one of Bulgaria's architectural jewels.

This poignant art installation raises awareness of violence against women.

Remnants of cone-shaped fascist bomb shelters in Milan.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

Does this strange mural depict witches battling beneath a penis tree?

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.