The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

A moody and picturesque riverside ruin overgrown with vegetation.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

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

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

1513 Turkish world map, full of European state secrets and snarky commentary.

A section of the long chain that blocked enemy ships from entering Constantinople.

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

A fountain standing as a testament to a doomed alliance.

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

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.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

Dramatic river bend surrounds a natural red-rocked pedestal.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.