Home to some of the oldest hominid fossils ever found.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Groups of prehistoric tombs that dot the mountains of northern Oman.

This remote British Imperial telegraph relay outpost drove men insane.

This indoor ski resort has a mountain contained inside a mall.

Whitewashed mosque contains the world's largest carpet.

This bazaar is one of the oldest in the Arabian world.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A marvel of Byzantine engineering under the streets of Istanbul.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Giant topiary dog once played a role in a terrorist bomb plot.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Giant fruit signaling the entrance to a tropical paradise.

Rainforest filled with record-holding eucalyptus.

The once-dying town of Sheffield, Tasmania has reinvented itself as a village of painted wonders.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A misnamed well, with a deep dark past.

Unusual British home built to disguise a water tower.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.