An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

A hugely vast Irish landscape of barren rock that stretches for miles.

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

Museum about life, death, and cannibalism in the Stone Age.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

This hilarious English intersection is an automotive whirlpool.

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

The longest hedge maze in the world.

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

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

The first archaeological site discovered by aerial photography.

Famously misunderstood wonder of the ancient world