These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

Where Agatha Christie mysteriously disappeared in 1926.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

Carved initials which are nearly 500 years old preserve the deposed Queen's presence at Hampton Court Palace.

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

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

The last resting place of the famous Native American princess is marked by a haunting monument.

A stretch of land where the sour-sweet vegetable is cloaked in darkness and grows so fast you can hear it crack, squeak, and pop.

One of the shortest streets in York has an especially odd name.

The oldest working Brewery in Britain.

One fisherman has used his love of pebbles and shore to create a crazy garden of rocky art.

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

The whimsical twist of this spire was either caused by the Devil, an unexpected virgin, or lead.

A close look reveals that the Scottish monument is just slightly off-kilter.

The longest and tallest aqueduct in Britain can actually be sailed across.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

This overlooked street light once served as a KGB dead letter box.

The elegant structure of this 19th century railroad bridge creates an illusion of infinity.

Scotland's only funicular railway is also the United Kingdom's highest.

This network of narrow, medieval passages has the most delightful name.

A Neolithic burial site built 1,000 years before Stonehenge.