Where was Late August at the Hotel Ozone filmed?

1967 film by Jan Schmidt

Late August at the Hotel Ozone (1967) was filmed at 3 places in the Czech Republic: Mohelno, Hradiště Military Area and Mohelenská hadcová step. Every place comes from Wikidata.

See them on the map → Wikipedia Source data

Filming locations

Also per Czech Wikipedia's Výroba section

Czech Wikipedia’s Výroba section names 1 more place. Each links to the sentence that says so.