A beautiful oasis town dating back to the Roman period still serves as reprieve from the brutal summer sun in Libya.

A fortress-like granary that has been continually in use for more than nine centuries.

The ruins of a Roman fort lie in the shadows of an imposing medieval castle.

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

A unique two-level bridge designed to honor a king.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Longest fortress system anywhere in Europe.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This picturesque medieval monastery guards a small trove of historic treasures.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This huge metal monument is slowly being stripped to its concrete skeleton.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

Legend has it fairies gathered at the site of this medieval castle.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

An ethereal glowing blue ocean cave in Croatia.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

A tribute to the man who lit himself on fire and ushered in the Tunisian Revolution.

The largest salt lake in the Sahara is mysteriously alluring.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.