The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

The farthest northwesterly point of the British mainland is one of the most remote places in the Scottish Highlands.

A sea cave with a waterfall and Viking past

Microscopic scenes; some call it novelty, some call it art.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

Mysterious Spanish catacombs of unknown origins.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Bacteria and algae give the salty water its bubblegum hue.

A beautiful but toxic fountain of mercury.

This Gallo-Roman sanctuary is dedicated to Serápis, god of the underworld.

One of the world’s longest pedestrian suspension bridges.

A windswept necropolis carved into the rocks overlooks the "most Portuguese town in Portugal."

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This charming candle shop has been in business since 1789.

A submerged village appears when dam levels drop.

The world's oldest bookshop still in operation.