The decaying ruins of Wales' first asylum for the mentally ill.

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

A subterranean playground in an abandoned slate mine.

London's old-school healing garden.

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

A collection dedicated to the treatment of disease, held in London's oldest hospital.

The largest greenhouse in the world is home to over one million types of plants.

One of the world's largest collections of pathological specimens.

A unique waterfall that some believe attracts the fairfolk.

400-year-old garden, restored to beauty.

Surreal riveted sea forts once protected the Kent shores from German attack.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

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

Northern Ireland's Brobdingnagian stepping stones.

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

The longest hedge maze in the world.