Here are some of my favorite ones
I like paticulary surrealism as you can see
Max Ernst "Whole City"
Max Ernst "The Entire City"
It's something like less known version of "Whole City", but it's stunning
Yves Tanguy "Indefinite Divisibility"
Salvador Dali "Metamorphosis of Narcissus"
Salvador Dali "Burning Giraffe"
Rene Magritte "Castle In Pyranees"
Arnold Bocklin "Island Of Death"
There's also great paiting "Palace Over The Sea" by Bocklin, but I can't find picture on the net.
Giorgio De Chirico "Melancholy and mystery"
I love this painting, my imagination works when I see it ...
Andre Masson "The Torture"
I would like also to post the paiting of Maria Cerninova (better known as Toyen) "Castle Lacoste" but can't find it on the net