A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Europe's largest prehistoric mound – burial site of a legendary king?

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

The oldest working mechanical clock in the world.

The whimsical twist of this spire was either caused by the Devil, an unexpected virgin, or lead.

Climb to the top of this windmill for a scenic panorama and up-close look at wind energy production.

A miniature city, once ruled by the Queen of the Netherlands.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

The largest drain hole in the world.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

One of the world's southernmost bars.

A strangely forgotten claimant to the much contested title of "Source of the Nile."

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

Romania's triumphal arch looks out over Bucharest.

Scholar, adventurer, saint, and instigator of the Goa Inquisition.

A passage grave used in neolithic rituals.

The geographical center of Chile is a port so depressing that it has driven men to suicide.

One of Chile's most active volcanoes is riddled with beautiful caves.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

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

Rare karst landscape eroded from a flat seabed.