Casterly Rock is sculpted from a massive stone slope next to the Sunset Sea. It is commonly said to resemble a lion in repose at sunset. The Casterlys of antiquity erected a ringfort on the top, and its natural fortifications have been extended over millennia with walls, gates, and watchtowers. The current castle was built in the 12th century by King Robert I for his nephew Henry II. Since then it has been expanded many times, most notably by the Lannisters after they acquired it. Today the castle is occupied by Prince Tommen. The town itself is quite small, only having about 200 residents within its boundaries. Most people work outside the castle and travel here for visits or trade. There are no major industries in Casterly Rock; instead, it relies heavily on tourism. The town is surrounded by high walls for defense against raiders. Inside the walls is an old street with shops and restaurants. Beyond that is a new section of town built since the show started that includes homes for the staff members who work at the castle. There are several castles for tourists to see in the surrounding area, including the ancient kings' seat at Winterfell not far away. Also close by is Castle Black, home to the Night's Watch. These places are all part of the same network of protected areas called the Westerlands.