Tucked behind the Institute of Neurological Science down a decrepit street resides the largest display of human brains in Latin America.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

Fire meets ice at the southernmost volcano on Earth.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

An isolated dive site teeming with cnidarians.

A spectacular cave and a beguiling lake.

Mysterious rocks that ring musically when struck.

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

An exquisite tunnel of cascading flowers.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

A beautiful maze marks where three countries meet.

Museum covers every step of the chocolate-making process, from cultivation to the finished product.

Half of a waterfall goes into the river while the other half seems to disappear.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

An isolated village literally built into the crevices and rock formations of a mountain.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

A mecca for India's Jains.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A fifth-century temple improbably built into the side of a cliff.

A British general, a suggestive tree, a map of paradise.