Tata Castle, built at the mid 14th-century on the northern tip of Lake Öreg (Old Lake), is one of the jewels of Tata, Hungary. Its blooming can be dated to the reign of Sigismund of Luxembourg (r. 1433–1437) and Mátyás Hunyadi (r. 1458–1490) as the summer resort of the king and a favoured residence. It was burnt by Habsburgs and later renovated. The walls of the castle reflect the marks of romantic style which is due to the Esterházy family who used to live here.

Since 1954 the Castle has housed the Kuny Domokos Museum. The excavations and historical restorations of the building were carried out between 1964 and 1973.