An orangery is a building specifically designed for the cultivation and protection of citrus trees. It is typically a large, walled structure with a roof made of glass or other transparent material to allow sunlight to reach the trees. The walls are usually made of brick or stone and the roof is often supported by columns. Orangeries were popular in Europe during the 17th and 18th centuries and were used to grow oranges, lemons, limes, and other citrus fruits.