Ostrava Museum occupies the old town hall on Masaryk Square, one of the oldest buildings in the city centre. Its exhibitions cover the city's history, art, natural history, and the landscape around Ostrava, giving useful context before you head out to the industrial sites at Lower Vitkovice or Landek Park.
The standout object is the indoor astronomical clock by Jan Masek, a tall, detailed piece with clock, calendar, astronomical, and planetary sections. It is the kind of local curiosity that makes the museum more memorable than a standard city-history stop.