Olympus Mons erupting

Picture of the Day 6/9/2018 - Eruption of the Olympus Mons on Mars seen by an astronaut; created by Reddit user Jason251.

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Martian landscapes by Ludek Pesek

Here are some of the best paintings of Martian landscapes by Czech space artist and illustrator Ludek Pesek (1919-1999).
More of his Mars art here.

Noctis Labyrinthus

Southern part of the Olympus Mons caldera

Astronauts exploring Mars by Sean Brady

Picture of the Day 27/4/14 - "Olympos station" (2007) by Sean Brady from United Kingdom.
Author's description of the scene: Setting up an automated weather station on the lower slopes of Olympus Mons.