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

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

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

The fountain marks the area where hundreds of accused witches were burned at the stake.

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

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A 30-acre garden inspired by the principles of modern physics.

360° views of the city plus five floors of optical illusions and hands-on science.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

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

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This abandoned Slovenian military barracks has become a punky-political art squat.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

The walls of this medieval church are covered with perfectly preserved frescos, including a pristine example of the Dance of Death.

"World machine" built by an untrained Austrian farmer.

Hidden beneath the streets of London is a secret subway that only carried mail.

A Hungarian optometrist's charming collection of Asian art and curiosities.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A Hungarian pharmacy museum with a box full of mummy powder.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

The hidden lair of an alchemist rediscovered in a 2002 flood.