This is the most significant piece of cultural heritage in Vranov; particularly the sacristy of the church. It is very likely that the sacristy was one of the oldest pre-Roman churches, Rotundas, established in connection with the mission effort of Sv. Vojtěch – Slavníkovec.
In the north-western direction from the current Komorní Hrádek there used to be the smaller castle of Hrádek Čajchanov, located on a promontory steeply falling into the Sázava valley and founded probably towards the end of the 13th century. Its scarce remnants have been preserved in a location approximately 200 metres from the castle. In about 1400 it belonged to Jan Zoule of Ostředek who, together with his cavalcade, took part in a minor skirmish in Bohemia at the time when King Václav I. was captured by the Noblemen’s Union. In 1404 Zoule’s cavalcade was captured by the land protection army and Hrádek was conquered and reduced to rubble. The estate, where the small chateau used to stand, was given as a gift of the King to Vice-Chamberlain Mikuláš.