A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This lovely ancestral home inspired the author D.H. Lawrence, and features a tunnel made out of a living willow.

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

The tradition of using flowers to decorate wells is once again thriving in England.

A village on the east coast of England that has almost completely eroded into the North Sea.

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

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

The world's oldest operational public pier railway has shuttled seagoing commuters from ship to shore since 1909.

Famously misunderstood wonder of the ancient world

It's possible to walk inside one of the largest Neolithic tombs in Britain.

The intended purpose of this unfinished Elizabethan building remains a mystery.

A remarkable medieval structure born from a 14th-century disaster.

This 11th century tower is said to be the oldest building in Oxford.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

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

One of England's most famous churches hides a pair of little known architectural treasures.

Surreal riveted sea forts once protected the Kent shores from German attack.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.