This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

An array of ancient artifacts from Bronze Age Bristol and other civilizations are housed in this museum.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Journey through this open museum where even employees remain true to period.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

A lush indoor jungle fills this bustling Madrid transportation hub.

Commonly acknowledged as the only public monument to the Devil himself.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

An ancient Egyptian temple in the middle of Madrid, Spain.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The building where Mary, Queen of Scots was said to have bathed in white wine.

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

Largest lake in Great Britain measured by surface area.

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

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

Inside this art museum resides one of Glasgow's most famous musical instruments.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The ritual has been performed uninterrupted for nearly 700 years.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A tribute to an explorer and naturalist often overlooked by history.