Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

There has been an astronomical clock on this spot since the 14th century.

The longest navigable underground river in the United States is home to countless blind and albino animals.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

A Museum of Holography frozen in 1974.

A promotional sun clock on the site of San Francisco's great raceway.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

The home of 1.5 million wood letters for printing is still a functioning workshop.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

The geographical center of Chile is a port so depressing that it has driven men to suicide.

A neutrino detector built into the largest man-made underground cavity in the world.

The rocks in this arid basin leave trails of movement behind them.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

Macabre astrological automaton clock dating to the late 1400s.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

One of the world's most complex timepieces.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Huge stone depressions which may have acted as an Incan agricultural experiment.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

A church of bones, decorated with 40,000 human skeletons.