These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

This "railway" for boats continues a waterway over a road.

A monument celebrating the idea of reaching inaccessible places.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

A desert that evokes the surreal.

This red lake 4,000 meters above sea level is home to rare flamingos.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

The soaring gondola lines form the longest aerial cable car system in the world.

The celebrity luchadores of La Paz are tough ladies in traditional petticoats and braids.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

Astronomical observatory above Lake Titicaca.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

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

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

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

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Building this tragically pointless stone barrier cost the lives of the prisoners made to build it.

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

This small uninhabited island offers Galapagos-like biodiversity.

This historic street in Quito is known for its seven stone crosses—and one presidential assassination.

Quito's historic, main square dates back to the 16th century.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.