catch a train at Marsaryjk Station in Prague for Milovice. At Lysa nad labem, you may have to change trains, but Milovice is the end station. You can't go wrong.
Milovice was the old Soviet Army Base after the 1968 invasion. Since fall of USSR, the military base has been basically abandoned or utilized for shooting range, off road craziness and now a wild horse reserve. The butterfly can be found in this area. It like Field scabious.
Medium sized Fritillary which is usually solitary. Lucky find. She likes dry grasslands.