This unimaginably large pile of sand near Nazca is one of the tallest dunes in the world.

Art school in the Amazon: Drugs, nature and sustainable agriculture.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

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

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

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

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

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

Largest site of dinosaur footprints ever found includes more than 5,000 tracks.

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

This Brazilian town built by Freemasons is full of colonial Masonic architecture and symbolic imagery.

The massive gardens and office of a Brazilian sculptor.

The ruins of this Brazilian island prison still bear the scars of the bloody rebellion that closed it down.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

A faux desert landscape in the middle of the jungle that sprouts oases during the rainy season.

High plateaus and beautiful waterfalls frame this ecologically significant nature preserve.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

Mineral springs believed to hold therapeutic properties draw in visitors from all over.

Massive rock sculptures formed during the time of the dinosaurs still stand undisturbed.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.