One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A 30-acre garden inspired by the principles of modern physics.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

This ancient Irish landscape boasts hundreds of legendary ruins.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

The home of Ireland's last leprechauns is officially protected by the European Union.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

A Roman spa buried deep beneath the City of London.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

Three small rooms at the back of the “official” church of London's clowns.

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

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

Charles Babbage's proto-computer, painstakingly brought to life.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

London's old-school healing garden.

Abstract dinosaur models in London.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.