Many postcrossers collect UNESCO cards and I got my first one now. Although I don't have particular preference over UNESCO or castles, this card is so lovely and I might consider changing my mind, LOL, :P From Marina in Belarus, for Slavic countries RR. =]

Castle of Mir from the North-West view. Winter landscape.

Origin: Minsk, Belarus (8,303km in 13 days)

Stamps: (left to right)
Wild Animals definitive - Wolf, Belarus, 2008
Wild Animals definitive - European mink, Belarus, 2008