Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

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

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

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

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

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

This home on a quiet suburban street is completely covered with vibrant mosaics.

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

This secluded walkway overlooks a magnificently wild London green space.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

A modern English garden of eccentric beasts, follies, and oddities.

This coffee shop lies hidden beneath a historic church.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

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.

Collection dedicated to brands, packaging and advertising.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A unique waterfall that some believe attracts the fairfolk.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

A network of concealed passageways lies within a busy London Underground station.

A mysterious artist-run cabinet of curiosities and library.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.