Oriental bazaar in the heart of Sarajevo.

Centuries-old bridges grown from tangled roots.

The Syrian headquarters of alleged hashish-smoking assassins.

A 1,500-year-old ghost settlement is slowly fading away.

Mysterious lost empire of the Silk Road.

A sacred lake with thousands of sacred carp and a biblical history.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

The largest hewn stone in history.

A city built from mud and known as the "Manhattan of the desert."

Rivers of cattle blood gone, a strange Escheresque building remains, the last of its kind.

An Amazonian hotel is the ultimate treehouse and provides stilt based accommodation.

Abandoned railway line circling the city of Paris.

The ship that got left behind.

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

Hydraulic systems in an ancient underground Iranian city.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

These little castles each held thousands of pigeons.

An Italian hillside ghost town.

UNESCO-protected ancient burial ground.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

A former French military respite turned jungle tourism hotspot.