The remains of a magnificent medieval fortress that was the capital of a vast empire.

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A curious cave church carved into the face of a cliff.

A futuristic, brutalist masterpiece that is also strangely prison-like.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

Bridge that died in war and was resurected.

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

Oriental bazaar in the heart of Sarajevo.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

A Mayan village preserved for centuries in volcanic ash.

A historic Montreal market that was the city's agricultural hub for over century.

An abandoned town centered around a paper mill powered by a large waterfall.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This odd little home was built right into an African rock face.

An ancient necropolis of magnificent tombs.

What happens when you cross a mayor and a painter?

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.