Červený hrádek is an early Baroque chateau on the northern edge of Jirkov in the Chomutov district. It was built in 1655 by Jan Adam Hrzán of Harasov. The construction site of the chateau was a rocky promontory at the foot of the Ore Mountains, on which Borek Castle used to stand. The chateau complex has been protected as a cultural monument since 1963. There is a large park and the castle park in the vicinity of the chateau.