This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Legend says this cave housed a 16th-century cannibal and his family of 48.

Possibly the oldest living thing in Europe, more likely a pagan survivor.

The final resting place of soldiers' loyal canine companions.

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

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

Hidden in a Scotland museum is a copse of extinct tree stumps.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

This Scottish bridge seems to compel dogs to leap to their death.

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

London's old-school healing garden.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

A fantastic castle rumored to be the birthplace of King Arthur.

A historic house left in "dramatic still life."

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A hands-off space for graffiti artists to hone and display their skills.

A kaleidoscopic warehouse-maze of handmade neon signs.