For hundreds of years, Andean people recorded information by tying knots into long cords. Will we ever be able to read them?

Every spring, creepy black 'spiders' sprout up on Mars as buried carbon dioxide ice releases dusty geysers of gas. New ESA images show the phenomenon has begun in the strange Inca City formation.

This causes them to create black branches measuring from 0.03 to 0.6 miles across (45 meters to 1 kilometer) and dot an area near Mars' South Pole known as either Inca City or Angustus Labyrinthus.

The planet Mars holds many surprises. One of them has sparked particular curiosity. In the region known as Inca City, what appears to be a multitude of black spiders emerges on the surface. What are ...

Peruvian and British explorers say they have discovered a lost Inca city on a peak in the Andes that was used as a place of resistance against Spanish conquerors. This site may ultimately yield a ...

The Inca city in Peru is one of the most recognizable historical sites in the world. Built in the mid-15th century, it served as a royal estate for the rulers of the Inca Empire before the arrival ...