Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

A study of Fascist era Art Deco design in Italy.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Grab a cuppa at England's first and only domestic tea plantation.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

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.

Artists and musicians now rule over this former rail station.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

The remains of Crystal Palace Great Exhibition of 1851.

A hands-off space for graffiti artists to hone and display their skills.

Rebuilt remains of a temple to Roman god Mithras.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.