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

White llama terraces dazzle in Peru's "other Machu Picchu."

A remarkable geological formation resembling a forest made of stone.

A market for witches is hidden within a train station.

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

A mysterious pre-Incan ruin believed to have miraculous healing powers.

Extraordinary rock formations in open Peruvian fields.

Ain't no party like a ghost town party.

An indigenous take on European design creates a stunning visual overload.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

Concrete construction materials turned into a fashionable capsule hotel in rural Mexico.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

Frida Kahlo's childhood home, now a museum of her life and works.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

An experimental, automotive replica of Stonehenge.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

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

Homemade outdoor church and sculpture garden decorated with glass shards.

Robots, lasers, and whoopee cushions, oh my!

A bizarre house filled with an astounding array of collections.

This cave holds a surprisingly colorful variety of geological oddities.

A bypass decorated with large wooden troll carvings.