The House of the Dragon was the fortress of Magnus Greel. It was built over many months by the Tong of the Black Scorpion. Magnus had his time cabinet taken to the house. He had Henry Gordon Jago and George Litefoot imprisoned there. They escaped down a serving hatch, but were recaptured.
The dragon statue in the house. Mr Sin sits in front while Magnus Greel stands to its side. (TV: The Talons of Weng-Chiang)
The Fourth Doctor and Leela confronted him at the house. Greel had his aid, Mr Sin, man the dragon statue. It fired beams from its eyes. Leela managed to shoot the eyes of the statue, preventing its use. The Doctor threw Greel into his catalytic extraction chamber, killing him. Mr Sin attacked them but was also defeated. (TV: The Talons of Weng-Chiang)