From one extreme showing a beautiful medieval (yes, again) castle in the Czech Republic...
The back of the card says the following which I have tried to translate using the Google translator:
The former guardian of the western borders of the kingdom, the powerful and ancient castle Loket has opened its doors to visitors during the winter. In addition, snow can conjure up a becoming hat, along with the charming town beneath the castle.
..to the other of an industrial complex
From the back of the card:
The old steel works. The idea of establishing an ironworks using untapped black coal deposits dates back to 1767. The works originally had been intended as mere departments of the Frýdlant foundry, but before starting construction in 1829 this plan was abandoned and Vitkovice emerged as an independent enterprise
The town of Ostava is the most industrialised of the Czech Republic although it was originally an agricultural village. Mining stopped in 1994 and part of the ironworks closed in 1998. There is now a Mining Museum there, the largest of its kind in the world. The old steel mill is part of the European Route of Industrial Heritage.
It may seem odd to you, it seems odd to me too, that I collect postcards showing beautiful medieval buildings as well as industrial heritage. I'm not at all sure why I find it so fascinating but maybe Mrs. Brown, my history teacher, drummed the details of the Industrial Revolution into me better than I realised at the time.