Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

This ancient mountain monastery welcomes all manner of faith in an effort to keep Christians in Syria.

This abandoned bunker looks out over the Atlantic from its clifftop perch.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

This rare volcano spews the strangest and (literally) coolest lava in the world.

It marks the spot where the high-ranking British officer died during the Falklands War.

The southernmost Anglican cathedral in the world has whale bones standing in its yard.

This haunting ghost ship stands beached in the waters off the coast of the Falkland Islands.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

3,000 market stands in five former Zeppelin hangars.

This 700-year-old Cyprus castle is the birthplace of the world's oldest wine, said to be toasted by Richard the Lionheart at his wedding.