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

An unusual stone chair can be found on the banks of the River Wear, not far from Durham Cathedral.

A rather grand, but tiny, folly on the banks of the River Wear associated with a Polish count.

These lamps were created to expel sewer gases after an event known as The Great Stink.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

This library dates back to the late 17th century and was one of the first public lending libraries in England.

Take afternoon tea in a 17th-century almshouse.

A monument with a strange legend involving a horse's tongue.

Though this bridge was originally built in the 12th century, only one of its 10 arches dates back that far.

This luxury shopping lane has been protected by its own tiny police force for over a century.

An artistic tribute to the famous singer, just around the corner from where he was born.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Vibrant street art created with mixed media.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This house's itty bitty size means no humans allowed.

Op-art architecture designed for happiness.

This strangely dressed taxidermy creature has a heartbreaking story.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

One of England's most famous churches hides a pair of little known architectural treasures.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

A lush indoor jungle fills this bustling Madrid transportation hub.

Huge winged monument in the United Kingdom.