A granary is a building designed specifically for storing grain after harvest. Think of it as a bank for food: farmers grow wheat, corn, oats, or other grains in their fields, harvest them in late summer or fall, then keep them safe and dry in a granary until they're needed.

Granaries have been essential to civilization for thousands of years. Ancient Egypt built massive granaries along the Nile River to store wheat during good harvest years, protecting against famine when crops failed. The Romans constructed enormous granaries in their cities to feed their populations. Without granaries, societies couldn't save food for winter, feed their armies, or survive bad growing seasons.

A good granary keeps grain dry and protected from rats, mice, insects, and moisture that would make it rot or grow mold. Many granaries are built raised off the ground or have smooth walls that rodents can't climb. On the American frontier, farmers built small wooden granaries near their barns. Modern grain elevators, those tall, tower-like structures you see in farming towns, are essentially high-tech granaries that can hold millions of bushels of grain.