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

A library where thousands of books explain how to avoid another Great Recession.

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

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

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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

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

A book bound in the skin of an infamous criminal, along with countless other specimens.

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

A 18th century graveyard and its astonishing cortege of macabre iconography.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

If you want to get married in the White Marble City of Ashgabat, you should do it in this surreal disco ball building.

Iran's colorful terraces are a rare geological masterpiece.

Ride a dragon train into a world of dwarves.

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

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

One of the first hotel rooms in a pod.

Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The glowing blue Nymphaeum of Emperor Tiberius.

Reputedly haunted sandstone necropolis with exquisite stone carvings.