Pic #21 - Moonscape. By Luděk Pešek
Pic #22 - Saturn from Titan. By Luděk Pešek. Titan always reminds me of Hardwar, and get a little hankering to install it somehow. I'm not sure if it's possible with Wine. But maybe on virtual machine...
Pic #23 - Airport on the ocean. Isn't that a seaport?
Pic #24 - Mars from Deimos.