This mysterious marker puzzles pedestrians and infuriates geographers.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

The longest step street in the city.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

Mystic Incan rock piles three miles above sea level.

The Peruvian Andes are a center of hummingbird diversity, and this garden offers an opportunity to see more than 30 species of hummingbirds.

Haunted by its violent past, this colonial bastion was the largest Spanish military installation in the Americas.

In the upscale neighborhood of Miraflores in Lima, a pretty little park is home to dozens of cats.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

A Christian monastery stands on what was once a holy Incan temple.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

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

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

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

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

The large collection of pre-Columbian pottery might make you blush.

The highest tropical mountain range in the world is in Central Peru, home to a vast array of exotic and quirky plants and animals.

A pretty park of over 1,600 olive trees that grew from just three saplings brought over from Spain.

The world's largest clay lick, where parrots gather to snack.

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

Did Inca children also slide down these smooth rocky slopes above Cusco?

Death rituals and sacrifice inside a Peruvian megalith.

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