The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

The remains of Crystal Palace Great Exhibition of 1851.

Abstract dinosaur models in London.

A vortex fountain that seems to rise out of the ground.

Huge winged monument in the United Kingdom.

Remnants of a cone-shaped Nazi bomb shelter.

Ancient Bronze Age rampart that was used into the middle ages.

Huge standing stones mark a site of megalithic mystery.

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

A modest stone circle in North Wales.

The view that inspired the scenes of Dracula's first landing in England.

A six-ton wedding present for the King of the Scots.

A student driver's nightmare.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

The largest stone moai on Rapa Nui.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

A brick foundation and piles of listing building materials are all that remains of this World War II POW camp.

The view from this giant Stone Age toad is unexpectedly beautiful.

Just another ancient, mysterious Irish stone circle.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

The bears of Bern have been a city highlight for over 500 years.