The southern wing apartment of the Palace, which Antal Grassalkovich I rendered at the disposal of his friend, Count Kristóf Migazzi, Bishop of Vác and Cardinal Archbishop of Vienna, was converted into a theatre by Prince Antal Grassalkovich II between 1782 and 1785. The Palace theatre was opened earlier than the Castle Theatre that the Buda Carmelite church was converted into at the instigation of Farkas Kempelen in 1787.

We recall days Charles IV and the Horthy Family spent in Gödöllő in the Gizella Wing that was reconstructed, financed by the EU. We show the headquarters for the Hungarian Soviet Republic, as well as the period when the castle functioned as social institution and military base for the Soviet army.

We also show details of the reconstruction process that began in the 1980s, and locations of Hungarian Presidency of the Council of Europe. In addition to beautiful interiors, the visitors will find great interactive elements, too. The corner room is also an exhibition room where a scale model, like a time machine, shows its history, and where in the drawers of the showcases there are treasures, photos and items to be touched and felt awaiting the visitors.

A picture gallery about members of the Habsburg family is shown in the hallway of the Gizella Wing. In addition to members of the Habsburg family, there are also portraits of the palatine branch of the family.

The base for the material was the heritage of the Stephanie of the Lónyai Family.

Grassalkovich who came from a lower noble family and had an education in law, - as a result of his talent - completed a career rising high. He had an important in rising the Queen to the throne, since during the Austrian War of Succession (1740-48) it was Grassalkovich who organised the support of the Hungarian nobility. As a reward for the successful increase of the wealth of the chamber, Antal Grassalkovich the 1st was risen to the rank of a count by Maria Theresa in 1743, and also appointed as a secret councellor.