The Esterházy Castle that was designed by the architect Jakab Fellenthali Fellner is situated by the Old Lake in Tata, near the fortress. The castle was constructed in the period between 1765 and 1780 in the Baroque style. The young architect Jakab Fellenthali Fellner became the head architect for the counts Esterházy by designing the Esterházy residence in Tata. With time passing he was given nobility for his merits.

Through the king's guests, the castle hosted a number of historic events and diplomacy. In 1809 the Emperor Franz I. and the king signed Treaty of Schönbrunn in the North-East tower room. At the end of the 19th century, Franz Joseph I, king of Hungary, and William II, German Emperor visited the castle during an army exercise. In 1921, the castle served as refuge for Charles IV and the Queen Zita.

The main corner building is enclosed by a smaller, one-story castle and some outbuildings. The coach house opened from the yard. A number of beautiful rooms in the main building can be found in the castle. The royal dining room is a special one. In its supraports, images of the Esterházy Castle in Fertőd and the Fortress in Tata are to be seen. The library furniture was preserved almost intact. Two bathrooms, one of which is covered by pink marble, the other is covered by Dutch hand-painted tiles. In the garden of intimate atmosphere, the visitors will find statues, a fountain and grottas, they all need reconstruction, but are worth to see them even now.