Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Hidden in plain sight on a gable between two towers on the roof of shipping firm F. Laeisz' headquarter in Hamburg sits an unexpected bronze sculpture.

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

Where royalty waits in the height of luxury.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

The rusting relics of Southampton's former luxurious flying boat industry.

This 700-year-old storehouse was a POW jail, aviation workshop, and Titanic memorial before becoming a brewpub.

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

One of the oldest seagoing boats in the world can be found at the Dover Museum.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Ship-sized kinetic sculptural fantasy.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

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

The Great Fire of London and the regulation of one-way streets both started in this alley.

The commemorative stone column conceals a secret laboratory.

There has been an astronomical clock on this spot since the 14th century.

This environmental engineering marvel keeps salt water from the Elizabeth River.

This striking fort on the Maginot Line looks just as it did after being destroyed in the Fall of France.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

The world's largest boar is a huge steel titan found at a French rest stop.