The castle area of Banska Bystrica is the oldest part of the town. The castle complex was built in the 12th and 13th centuries, and consists of both religious and secular buildings. All that remains of the original town walls and the castle's 18 bastions are three bastions and one long section of wall. The complex also includes the Parish Church of the Assumption of Mary, which was built in the Romanesque style in the 13th century, the Church of the Holy Cross dating from 1492, the Matthias House constructed in 1479, The Barbican, and the Old Town Hall. It is best to tour the area with a local guide who will identify the buildings, and provide the necessary historical perspective.

Monumental church placed very close to main square was built in middle age from donation of german miners (church is called German church). Beautiful altar made by famous sculptor Mister Paul is one of the "must see" places. Problem is to find the church open for travellers and to find any person helpful for visitors.