Monasteries on rock pillars, once accessible only by frayed ropes.

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

One of the largest caves in the world open to the public.

These tracks are believed to be from a panicked dinosaur stampede.

A miniature train-ride through Slovenia's largest cave system.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

One man's swirling six-acre monument of stone.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

A scenic overlook of a pit mine hundreds of meters deep filled with blue water.

When you get to Magnetic Hill park near the sign, put your vehicle in neutral gear, and watch it roll uphill...

The largest island on the great salt lake is home to curious creatures and strange stories.

A spectacular cave and a beguiling lake.

Hiding the longest subterranean river known in the world.

A geological oddity topped with a 2,000-year-old pagan temple.

A fiery crater has been burning in the Karakum Desert since 1971.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

A medical facility that has been kept frozen in time.

These phallic stone spires once served as Tolkien's Paths of the Dead.

A place as enchanting as the journey to reach it is harrowing.

A tower built by an emperor for an antelope.

One of the largest necropolises in the world is home to a stunning array of historic Middle Eastern tombs.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

These stairs were built to accommodate royals mounted on elephants.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.