The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

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

Hop aboard a charming bog train to explore this rare open-air museum of peat.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

19th century tunnels burrowed under Liverpool.

Quirky Welsh observatory unites art and science.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

Rebuilt remains of a temple to Roman god Mithras.

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

This series of Scottish caves has no clear purpose other than baffling historians.

Three bridges straddle a stream, one stacked upon the other.

The first privately owned air raid shelter in Britain, built after a horrifying night of Zeppelin bombings.

This Bronze Age burial mound used to be called "Robin Hood’s Piss-Pot" until it was renamed by spoilsport Victorians.

An enigmatic natural rock formation with a manmade passage cut through the center.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."

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

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

There's a strange stone hoodoo towering atop a wooded hillside and no one is quite sure how it got there.

In England, an 18th-century water-powered workshop still stands.

One of the last doorless, continuously moving elevators still in use in the U.K.

Cemetery established by the Victorians as a solution to the overflowing graveyards.