Český Krumlov
This is a beautiful historical (UNESCO listed) town in the south of the Czech Republic, close to both Austrian and German border, about 2 hours car ride from Prague. Probably the most frequently visited Czech place outside Prague. Here are some pictures.

Satellite view of the town taken from Google Maps, 2019
The garden coming up from the bottom left corner of the image belongs to the castle (which is in the center, right above the river loop). There is an open air theater with a moving stage there with daily performances in summer (except Mondays). It is quite famous, so tickets need to be reserved in advance, e.g. here