An architectural oddity hides in plain sight on this iconic London bridge.

Ship-sized kinetic sculptural fantasy.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Giant, friendly pelicans in Central London, the most unlikely of places.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Historic medieval fortified city in southwest France.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

A strange rock formation with numerous legends trying to explain it.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

One of the last remaining railway viaducts equipped with a transporter ferry.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

The only remaining U-boat that is still floating never actually saw any action in World War II.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Model Trains and Much More in Hamburg.

Hamburgers are intensely proud of their tunnel beneath the river.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The modern birthplace of Irish freedom.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.