Rácalmás is a Danube- side town in Fejér County , in the Dunaújváros district . Sights Jankovich Mansion – Jankovich family The Rácalmás Islands Nature Reserve (Rácalmás Big Island) The Old Village Millennium Park Modrovich-Bay Mansion ( Modrovich Mansion , Modrovich Castle ) – Modrovich & Bay Family Remains of a medieval church next to Királykút Lattice Church Lutheran-Reformed Church , Széchenyi Square Jankovich Chapel