Check out this stations antenna garden. Its huge.
The card says not to return the QSL, but instead work them every contest. :)
I like history and thus the next card from Bulgaria.
With the downfall of the Second Bulgarian Empire in 1396, its territories came under Ottoman rule for nearly five centuries. The Russo-Turkish War (1877–78) led to the formation of the Third Bulgarian State 135 years ago. And this is the QSL to commemorate it all.
(Click the QSL's for a larger version.)