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

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

An abandoned Cold War missile radar site.

A little-visited waterfall in an otherworldly landscape.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

The abandoned summer estate of the former Greek Royal Family.

This stretch of the River Severn where large waves flow against the current is the birthplace of river surfing.

In an arboretum with hundreds of memorials to the fallen, this one might be the most poignant.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

Sidney Scurvy, the interactive computer sailor, takes you on a journey to discover the everyday lives of Cook and his men.

The wreckage of an old coastal trading vessel is only visible at low tide.

Over 100 years ago this pyramidal holding cell was reserved for rowdy drunks but now only offers five minute sentences.

A stone obelisk towering over the surrounding countrysides beckons hikers across the rolling moors.

The remains of the concrete ship can be seen during low tide.

Half-drowned wooden stumps and stone blocks are all that remain of a Victorian landing that was destroyed by storms.

This centuries-old canal known as the Cuckoo Dyke has a staircase of locks suitable for a giant.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

This tiny 1930s Art Deco airport is a beautiful remnant of a bygone era.

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

Now isolated, this church was once the center of a bustling village that succumbed to the Black Death.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

The grounds of this Jacobean estate contain one of the oldest mulberry trees in England.

This remote castle was built to be a wealthy businessman's palace of vice but is now simply a historic vacation cottage.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.