This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

This mysterious hilltop collection of Druid carvings isn't quite what it seems.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

These morbid carvings remind churchgoers of the inevitability of death.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Three stone bridges straddling the River Gowy form part of the medieval road from London to Holyhead—despite a common nickname, they're not Roman.

The fake World Cup prize was secretly created after the first one was stolen in 1966.

The city of Manchester quietly unveiled this tribute to a 19th-century massacre.

This dreamy street will transport you to wintertime in Victorian England.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

A tiny, heartwarming piece of art hiding in plain sight.

Despite having a dome made of papier-mâché this tiny observatory has survived for over a century.

A tiny, hidden alleyway dedicated to the father of meteorology.

These unique stepping stones hug a river's edge to take hikers on a journey through a limestone gorge.