This Scottish burial tomb once held hundreds of ancient eagle bones.

The ruins of a defunct limestone quarry still haunt this Scottish promontory.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

The site of the most dived wreck in the UK.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

This ancient Irish landscape boasts hundreds of legendary ruins.

One family's environment-friendly hobbit-house in Wales.

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.

Inspired by a dream, a hermit carved out a home in this sandstone bank to live a life of contemplation and prayer.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Described by William Wordsworth as a "World of Wonder."

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

The largest portal tomb in Europe has a capstone weighing around 150 tons.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

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

These quintessentially English stepping stones were built for Victorian tourists.

The remains of centuries of copper mining appear like an alien landscape.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

The photographs of "fairies" that fooled much of the world (including the creator of Sherlock Homes) were taken at this English stream.

At night, the enormous sculpture looks like a UFO hovering above the English hills.

A lavish Victorian mansion wound up inheriting a gruesome reputation that would be its demise.

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