Knights Templar are visible inside this stunning Cistercian abbey.

The ruins of this once gorgeous medieval church are still standing, despite the region's constant flooding.

At this medieval church, Thomas Beckett was cantonized as a martyr.

A stunning fountain depicting a mythological she-goat carved directly into the rocks on the grounds of a Renaissance palace.

Ancient, mysterious stone altars are hidden among wild woods in central Italy.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

This mysterious ancient arch is hidden in the forest of Simbruini Mountains Regional Park.

Although their purpose is unknown, these ancient Roman supporting arches showcase Hellenistic ingenuity.

This former papal residence was the site of an infamous incident known as the “slap of Anagni.”

The “Sistine Chapel” of the Middle Ages merges 11th-century science and religion in wondrous hues.

A medieval house with mysterious alchemical inscriptions on its facade

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

Gargoyle head that brings good luck.

An ancient knight and a symbol of the city's freedom.

A field filled with carved medieval tombstones called stećak.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

A war-torn Olympic relic is being overtaken by graffiti and nature.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

The first mosque in the world to receive electricity.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.