The Incas were wonderful builders. They designed their cities to blend with the landscape around them. They built to last. The cities were safe. Rather than build walls around their cities, each city had a fortress built beside it. In times of trouble, people ran to the fortress for protection. The rest of the time, the fortress housed the military. The military kept an eye on the people, and on anyone entering or leaving the city.
Cities were built around a central plaza, as they so often were in ancient times. The plaza was surrounded by temples and government offices and homes for the priests and nobles. The Incas loved shiny things. The nobles decorated their doors with gold and silver and anything shiny. Homes had slanted roofs and funny doorways, to strengthen them.