Veliki Preslav Historical and Archaeological Reserve, comprising the medieval capital of Bulgaria Preslav, as well as the Archaeological Museum are located 20 km from the town of Shumen. Here one can see the remains of the most important administrative, religious and economic buildings from the metropolitan period of Preslav. The peripheral town (3.5 sq. km. area) is surrounded by 10 m tall and 3.25 m wide white stone walls. Another wall surrounds the inner town. It houses the complex of the royal residence: the Grand Palace, the Throne Palace, the Round Church. The town's sewerage and water supply were outstanding for its time. The reserve is included in the list of the Hundred National Tourist Sites.