Tapestries and other decorations would have been hung on the walls of medieval castles. Additionally, animal heads and other trophies captured by the lord of the castle would have been displayed.
The ones that were organized as Mont and Bailey castles usually still do because they began with walls, but there are castles with no walls. I can think of several that I have been to in Germany. Peterhof in Russia built by Peter the Great has no walls, but does have extensive gardens. The Hermitage also in Russia was the winter palace of Catherine the Great has no walls. Linderhof in Germany has no walls. Many castles and palaces we see today are rebuilt and remodeled by various people through the centuries.
A castles main defense were it's high stone walls and sometimes a mote, a channel of water
Medieval castles were needed for safety because they protected people from invaders and other dangers. Castles were also built to defend from danger. They were equipped with high walls, murder holes, cover for soldiers, and more.
Castles usually have a mote, towers, and long halls. They also have special defenses inside and outside of the structure.
Medieval castles were usually made of stone, often held together with mortar. Some castles were made of wood, and earth was also used in the construction of some castle defenses and walls.
The slit windows or archers' windows of medieval castles were also called loopholes.
Castles were needed to protect kingdoms and towns. Small towns and forts often have walls that are made of thick wooden poles. Fortified castles, which is basically a fortified palace, was needed to protect the king and all the royalty. It is often also the place of meetings and such. Only great cities build big, stone walls all the way around. I'm assuming they would only build such a large project if they were in fear of an enemy and wanted security.
The medieval stonemasons built large structures like Gothic cathedrals, churches, castles, etc. out of stone. Modern stonemasons build stone walls and decorate the outside of floors, walls, etc. with stone.
castles had walls, archers, and anything they can pour over the walls. moats & drawbridges as well-walls specially designed for archers hence the jagged pattern
Castles were built in various styles and forms throughout history, depending on the time period and region. Some common types include motte-and-bailey castles, concentric castles, and stone keep castles. Motte-and-bailey castles were early medieval fortifications consisting of a wooden or stone keep built on a raised earthwork called a motte, with an enclosed courtyard known as a bailey. Concentric castles were developed in the 12th and 13th centuries and featured multiple layers of defensive walls and towers. Stone keep castles, also known as Norman castles, were constructed primarily in the 11th and 12th centuries and featured a central stone tower or keep surrounded by walls and other structures.
The great hall was a large room where feasts, wedding celebrations, receiving visiting nobles, and holiday festivities were celebrated in medieval castles. The walls were lined with silk tapestries, and small wooden or stone benches were placed underneath windows so guests could enjoy the view. Long wooden tables dominated the room while dining, and they were taken apart to make room for dancing.
The average size of a castle in the Middle Ages varied depending on its purpose and location. However, many castles were typically around 1,000 to 2,000 square meters in size. These structures often included a central keep or tower surrounded by defensive walls, courtyards, and other buildings. Some larger castles could span several thousand square meters and feature multiple towers, halls, and living quarters.