A 1,215-foot tunnel transports pedestrians beneath the River Thames.

One of the indelible moments of the American Revolution took place at this location.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

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

Manchester salvaged this sculpture of the adopted Mancunian when it was no longer wanted in Ukraine.

Be on the lookout for the symbolic insect all over the city.

An enormous steel waterfall is a nod to the substance that shaped Britain's Steel City.

The metal frame is all that's left of a wicker sculpture which once towered over the M5 motorway.

Follow the original medieval paths that wind through this intriguing section of the city.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Black cat statues guard this temple-like Egyptian revival factory.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A cluttered and astounding collection of antiquities and curiosities.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

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

A typographic tribute to the many comedic greats who make Great Britain laugh.

This sculpture is an instrument played by the swell of the seas.

Locals spent years successfully fighting to save this beloved Brutalist behemoth from demolition.

A memorial to the politician who became Great Britain's first fatality to be caused by a locomotive.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A fascinating insight into daily life in the Eastern Bloc.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.