What are the tiers on ziggurats?

Ziggurats are stepped pyramid structures that were built in ancient Mesopotamia, typically featuring multiple tiers or levels. Each tier usually recedes as it rises, creating a terraced appearance. The number of tiers can vary, but they commonly range from two to seven, with the uppermost level often containing a temple or shrine dedicated to a deity. These structures served both religious and administrative purposes, symbolizing a connection between the earth and the heavens.