A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A glacier pocked with ice caves and surrounded by rainforests.

New Zealand's epic shrine to all things puzzling.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

An unusual and powerful memorial in which earthquake victims are remembered by empty white chairs.

This semi-permanent cathedral was built of cardboard, wood, and steel after Christchurch's 2011 earthquake.

After the devastating 2011 earthquake, historic Christchurch begins to recover, starting with the pop-up Re:START mall.

The world's first military tank was designed in this English city amid the stalemate of WWI trench warfare.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

A tiny park in the middle of some big power politics.

A sixth-century Byzantine cistern hidden below a modern carpet store.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

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

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A fountain standing as a testament to a doomed alliance.

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.

A open air theatre built on a cliff by an eccentric British woman.

The largest greenhouse in the world is home to over one million types of plants.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

A monument to the real explorer and bear who inspired characters in Philip Pullman's 'His Dark Materials.'