In 2018 I visited Zakarpatie Region in Ukraine. It is near the slovakian border.
Namely, I visited:
Uzhorod city and the castle in Uzhhorod
Palanok Castle in Mukachevo
Nevitsky Castle (near Uzhhorod) it is castleruin
Pereni Castle (one of the most beautiful place i have ever been/visited)
Voevodyno (very nice place in the middle of the forest)
Bunker Liniyi Arpada (One of the biggest bunker in Europe, only 10% of tunels are available for public visit)
Below you can find some Fotos according to these places.