These "bridges" help confused bats cross the road.

400-year-old garden, restored to beauty.

The designer of this railway tunnel added a birthday present for himself.

Don't be fooled by this fake medieval facade even if it is almost 300 years old.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Created by one of England's most prolific labyrinth designers, inspired by Bath city history.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A sweet symbol marks the place where torturous executions were once carried out.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

The most loyal of little dogs, or a Victorian era publicity stunt?

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

London's smallest police station is barely the size of a phone booth.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A public urinal so pretty, it was declared a national monument.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.