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

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.

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

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

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

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

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

Visit a prison tower used during witch tribunals.

The world's largest collection of fire-fighting items dating back almost 350 years.

Study the Alien etchings in this fountain while you refill your water bottle.

A statue of the Swiss cartoon character stands outside the school that inspired his creator.

A plain wooden seat that once belonged to one of the most prominent figures of the Protestant Reformation.

Switzerland's oldest public observatory is an important part of the Zurich cityscape.

On the side of a building, a depiction of the woman who became a local legend by tossing soup out her window.

A bronze statue commemorating his royal meowjesty, Toulouse.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

Middle-earth in the middle of Switzerland.

One of the most historical literary characters continues to stroll his hometown.

Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

These legendary stone steps were once used to haul coffins up the rockface.