Doubravská hora Castle, Castle ruin in Trnovany, Czech Republic.

The Gothic castle ruins stand prominently on Doubravská hora hill, featuring stone walls, foundations, and remnants that showcase medieval defensive architecture from the 15th century.

Built in 1483 as a strategic fortification, Doubravská hora Castle served as a noble residence and defensive stronghold until it was destroyed in 1639 during the Thirty Years' War.

The castle hill has served the spa town of Teplice for recreation since the 19th century: a small restaurant opened in 1855 on the site of the former knights' hall, and in 1884 architect Bedřich Ohmann added a New English-style dining wing. Today the Association of Multi-Purpose Sports and Activities (AVTS) is based in the main building and runs amateur radio broadcasts (Radioklub Teplice No. 50037) and social events there.

The hill rises on the eastern edge of Teplice, and the ruins are reached on foot; the main building now houses the Association of Multi-Purpose Sports and Activities and a radio club. The casemates were adapted as a dwelling by caretaker Josef Ritschel in 1791, and the site is a protected cultural monument.

The western tower was rebuilt to its original height in 1884 to plans by architect Friedrich Ohmann and topped with a roof, then used as an observation tower; the restaurant added beside it burned down in 1896. Since 1966 the site has been managed by Svazarm's successor association, which runs an amateur radio club (Radioklub Teplice No. 50037) from the main building.