This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

The remains of the great moral philosopher reside in a university in London.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

The cedar tree in Highgate Cemetery earned its title by accident.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

London's largest outsider art museum.

The oldest inn in England served brew to the crusaders.

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.

English antique dealers with a taste for the unusual.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

The anatomical-pathological collection of a man who changed surgery.

This tangled English forest looks like something right out of a fairytale.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

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

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This 1913 single-screen cinema is a charming survivor in the age of the multiplex.