Today, most castles have bare stone walls inside but in the Middle Ages they looked very different. Important rooms had colourful tapestries hanging on the walls, and paintings on the ceiling. Other rooms like kitchens or cupboards had plain white walls. Fireplaces kept rooms warm, and candles were used for light at night or in dark rooms. Glass was used later in the Middle Ages, but windows had shutters to keep out the cold and the weather. Religion was an important of the Middle Ages, and castles usually had chapels so that the people who lived there could pray.