The Baroque palace in Choroszcz was the summer residence of the noble Branicki family, and is now part of the Museum of Polish Interiors.

It was a private town, administratively located in the Podlaskie Voivodeship in the Lesser Poland Province.

[4] Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, the town was first occupied by the Soviet Union until 1941, and then by Germany until 1944.

In 1940, the Russians closed the psychiatric hospital and deported some patients to the Soviet Union, while others were relocated to the local rectory.

[4] In 1941, the Germans massacred several hundred remaining patients of the psychiatric hospital in today's Nowosiółki district as part of Aktion T4.