Petrohrad Castle, Baroque château in Petrohrad, Louny District, Czech Republic

Petrohrad Castle is a three-winged, two-storey château on a U-shaped plan opening onto a court of honour. The northeast wing is Renaissance, with a two-storey tower topped by a gable with swallowtail merlons and a walled semicircular rusticated portal; the other two wings are Baroque. A five-axis risalit with tall pilasters and a vase-topped attic fronts the northeast wing, and a seven-axis risalit with a two-arm staircase and tympanon stands before the central tract. The chapel of St Lawrence occupies one corner.

A Gothic castle above the village preceded the château; after it fell into ruin in the mid-16th century, Jaroslav Libštejnský z Kolovrat had a Renaissance château built around 1560. Burned at the start of the Thirty Years' War, it was rebuilt in the Baroque style by Giovanni Alliprandi under Heřman Jakub Černín between 1682 and 1710. A fire in 1915 led to repairs, and since the second half of the 20th century the château has housed a psychiatric hospital.

The castle chapel of St. Lawrence, in one corner of the building, was created by converting residential rooms in the first half of the 19th century. The castle is not open to the public, as it has housed a psychiatric hospital since the second half of the 20th century.

The castle is closed to the public: since the second half of the 20th century it has housed a psychiatric hospital, so interiors and grounds cannot be visited. A red-marked hiking trail from Černčice to Rabštejn nad Střelou, Žlutice and Bochov passes around the castle, allowing views of the exterior.

The castle is not open to visitors: since the second half of the 20th century it has housed a psychiatric hospital, and the buildings are closed. A red-marked hiking trail from Černčice to Rabštejn nad Střelou, Žlutice and Bochov passes around the castle grounds.