Expresive clinkstone mountain (593 m) with the ruin of medieval castle, western of village Petrovice. This castle was called Falkenburk, later in 16th century Old Falkenburk. We haven`t the returns of its origin. In the year 1437 the castle was burned out and rebuilt again. In the year 1467 the castle was dispatched by Zitauer army and ruined. Than there are a housing of robbers. In the year 1513 it was already houseless.