A once extravagant mansion, now reduced to ruin.

The heads of two giant mythological water horses honor Scotland's horselord past.

The remains of an anti-aircraft battery from World War II look out over Glasgow.

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

Largest lake in Great Britain measured by surface area.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

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

This giant wooden treehouse within a sprawling garden has its own eatery.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

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

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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Six neolithic sandstone boulders remaining from a dolmen.

Prehistoric sandstone menhir with Early Bronze Age cup and ring markings, also known as Robin Hood's Stone.

At almost 1,000 years old, this is the oldest known door in all of Britain.

This underpass became an unlikely piece of cinematic history after its appearance in 'A Clockwork Orange.'

The remains of a historic football stadium that once hosted 50,000 spectators.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This medieval church tower has maintained its clockworks since the 16th century.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.