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

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

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.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

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

A parade of antique steeds offers a quirky ride through history.

Britain's only herd of free-ranging reindeer.

This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

These medieval monastery ruins are surprisingly overlooked by most tourists.

Follow the original medieval paths that wind through this intriguing section of the city.

Built in the 1300s, this magnificent building that hosted England's kings and queens transports you to the Middle Ages.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A Japanese cat island also populated by the descendants of a band of banished samurai.

Rebuilt remains of a temple to Roman god Mithras.

An unusual round church in London with a Templar past.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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