The Holy Trinity is a UNESCO World Heritage site
As well as being briefly captured by the Prussian's. There was a conference held in town called the Punctuation of Olomutz where it was agreed to restore the German Confederation and Prussia accepted leadership of the Austrian Hasburgs. The town was later occupied by the German's, despite it being fortified eventually the ethnicity of most of the cities inhabitants was mostly German. After the revolution, though, the government rescinded its expulsion of Jews and they moved back into the city and built a new synagogue.
Tensions between the Germans and Czech people rose during the World Wars, though the town's main square was renamed Hitler Square after the German residents sided with the Nazi's. The Jew's new synagogue was destroyed in tensions between them and the German residents of the city. Fewer than 300 Jews from the town survived the Holocaust.
Olomouc took back the original name of the town square once the town was liberated. On leaving the city, the Germans shot at the town's astronomical clock and destroyed it. The only remaining pieces are in a museum. The Soviets rebuilt it in the 50's and it features a series of proletarians instead of saints. Ethnic German's were expelled from the city, in spite of many of the families having been there for a couple of century's, as part of the Potsdam Agreement, and the borders of Central Europe were redefined.