On Thursday I got three postcards: one from Belgium, one from France and one from China.
The card from Belgium shows Gaasbeek Castle. Gaasbeek Castle was built in the 13th century and was inhabited by various noble families. Today it houses a museum.
With a great matching stamp:
EUROPA (issued 10-06-2017)
with First Day Special Postmark
The sand castle on the stamp is based on real Belgian castles including Gaasbeek Castle. As extra the stamp also has sand texture.
Thank You very much Gerda!