Bananas are often left for the first monkey America ever recovered alive after being launched into space.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

This small primate research island is teeming with playing, fighting wild monkeys.

A geological bull's-eye visible from outer space.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Wondrous stalactites house thousands of bats in these African caves.

Gorgeous cave resemble a winter wonderland.

A glacier pocked with ice caves and surrounded by rainforests.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

A stunning silver lining to global warming's gloomy cloud.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Southern Ocean waters and glacial forces transform the Antarctic ice into these stunning bridges and caves.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

This legendary city has been a tourist attraction for centuries.

This Romanian village may have been drowned, but it is long from forgotten.

Virgil's many-mouthed gateway to the underworld.

Steaming blood-red hot spring from hell.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

A quick and simple solution to Cambodia's train woes.

A battle between nature and architecture in the Cambodian jungle.