Palaces of Western Semigallia are palaces of the 19th century mostly German nobility. A long time of peace allowed them to construct especially elaborate edifices.
The most famous among these palaces are those of Jaunpils (Neuenburg, 1906), Mežotne (Mesothen, 1802) Jaunmokas (Neu-Mocken, 1901), Šlokenbeka (Medieval castle repurposed in late 18th century).
Unfortunately, the palaces lost their interiors during the Soviet occupation (1940-1990). Pretty exteriors and courtyards are still nice to view however. Currently the castles are used for unrelated museums (that of roads in Šlokenbeka and that of forests in Jaunmokas) or as hotels (Jaunpils and Mežotne).