Featuring late-gothic architecture with heavy doors and double exterior walls, the church boasts the largest Transylvanian multi-paneled wooden altar and a remarkable wooden door which once protected the treasures in the sacristy. The altar was built by artisans from Vienna (Austria) and Nurenberg (Germany) between 1483 and 1513. The door, a true marvel of engineering, has a particularly ingenious locking mechanism with 15 bolts that can be simultaneously activated by a key. The mechanism stirred quite an interest at the Paris World Expo in 1900.
Visitors can also admire the towers surrounding the church, namely the Clock Tower, the Bell Tower, the Gate Tower and the Bacon Tower. Within the grounds are several other interesting buildings, including the Prison Tower – which once served marital counseling purposes.
From 1572 until 1867, Biertan was the seat of the Saxon Evangelical bishops of Transylvania; the gravestones of bishops can be seen inside the Bishops’ Tower.