The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

The final resting place of the great navigator, or maybe his brother.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

A lush indoor jungle fills this bustling Madrid transportation hub.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This stunning concert hall has become a symbol of Iceland's national recovery.

Three columns of volcanic rock shoot out of the ocean.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This elegant arc of a waterfall marks a religious turning point.

The most powerful waterfall in all of Europe.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

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

This demon atop the Notre-Dame de Paris looks utterly bored.

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