This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

A circle stone within a stone circle.

A mysterious bridge over a sunken Roman road.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

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

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

The quiet field that inspired one of the most famous songs of all time.

The oldest residential street in Europe also features an optical illusion.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

A midnight snack that lights up the night.

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.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

This small collection of rare books was uniquely locked up for safe keeping.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

This magical museum celebrates the life and work of a seminal children's book writer (and occasional spy).