The card of Archangel Michel's (Svirskaya) Church in Smolensk was sent with the stamp commemorating the 1150th anniversary of Rostov in north west Russia. The stamp would have been on a mini sheet like this one. Smolensk is also a very old city - the church on the postcard was built at the end of the 12th century.
I noticed a few other stamps with a similar colour to the one above so I took that as a theme:
From Bosnia Herzogovina, a donkey
Some traditional houses from Croatia
A sand gazelle from the United Arab Emirates
This is a post for Sunday Stamps, now hosted by Violet Sky at "See it on a Postcard!"