These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

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

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This series of Scottish caves has no clear purpose other than baffling historians.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

This early version of the guillotine was used to execute the man responsible for its construction.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

This luxury hotel suite is located deep in the bowels of an old mine.

The second oldest anatomical theater is housed in a museum of curiosities.

Early habitat dioramas and home of the elusive gaff, the skvader.

The world's first ice hotel is still one of the most elaborate and beautiful.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

The world's northernmost aquarium looks like it has fallen over.