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

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

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

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

London's old-school healing garden.

A subterranean playground in an abandoned slate mine.

A unique waterfall that some believe attracts the fairfolk.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

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

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

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

This tangled English forest looks like something right out of a fairytale.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Spend the night in this formerly abandoned traditional Scottish village.

The longest hedge maze in the world.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.