The Palazzo Castelmur in Coltura near Stampa belongs to the Bregaglia municipality. In 1961, the heirs sold the Castelmur property to the community and it was turned into a museum.
The Palazzo's architecture is a hybrid of styles. When Giovanni Castelmur (1800–1871) purchased the patrician Redolfi mansion, originally built in 1723, he added a facade flanked by towers in Lombard/Venetian gothic style; this was completed in 1854. The successful combination of old and new along with the luxurious furnishings are the work of various Milanese craftsmen such as engineer and architect Giovanni Crassi-Marliani, stonemason Giovanni Pedrazzini and painter Gaspare Tirinanzi. The remaining artisans came from the neighboring Lombardy region.
The interior design of the Mansion, although more opulent, is consistent with the exterior architectural style of the building. With the exception of one room, the wood paneling in the rooms located in the original Redolfi structure, are varnished or wallpapered. In the newer part of the Mansion, there is a lovely dining room, living room, red and green wallpapered bedroom and four small tower rooms. The walls and ceilings of certain rooms are decoreted with wall paintings; the trompe-l'oeil are particularly stunning.