Inca road system: Did you mean...?

View full lesson: https://ed.ted.com/lessons/the-rise-and-fall-of-the-inca-empire-gordon-mcewan It was the western hemisphere's largest empire ever, with a population of nearly 10 million subjects. Yet within 100 years of its rise in the...

A photograph of a macadamised road taken in the 1850s. The macadamised road, that is, a hard and relatively smooth road surface made using two layers of stones (one aggregate layer and a top layer of very small stones), was first made on...

The Shushtar Hydraulic System is a Sasanian era (3rd century CE) water irrigation system in Shushtar in Iran that included watermills, dams, tunnels and canals. The mills, one of which is still functioning, were used to grind wheat and barley...

The entrance to the water system at Tel Gezer in central Israel. This photo was taken during the 2011 excavations of the water system by the New Orleans Baptist Theological Seminary. The water system is believed to have been built during...

An Inca circular terracing used to increase agricultural yield. Moray, Peru, 15-16th century CE.

An Inca ceramic dish with a handle in the form of a bird. Peru, 1476-1534 CE. (St. Louis Art Museum, Missouri)

Inca qollqa (storehouses) used for storing grain and other foodstuffs. 15-16th century CE, Ollantaytambo.

A colonial-era illustration depicting Inca farmers using traditional tools such as the foot plough. By the native chronicler Felipe Guaman Poma de Ayala, c. 1613 CE.

Earth's solar system by NASA and Rawpixel.

An illustration of the solar system by Martin Kornmesser. From The International Astronomical Union.