This cramped crevasse saw the entire population of its island suffocated inside its depths.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Dictionary Johnson’s favorite feline.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

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

A Roman spa buried deep beneath the City of London.

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

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

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

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

The heads of two giant mythological water horses honor Scotland's horselord past.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

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

A church that bred legends, and served as an inspiration for the Da Vinci Code.

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

Repository for more than 22 million pickled specimens.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

The television series' iconic giant foot was borrowed from this classical painting.

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