Above is a close up of Mars, below is a close up of a baleen whale.
Date of discovery: April 11, 2017
Location of discovery: Mars
NASA photo source: https://photojournal.jpl.nasa.gov/jpeg/PIA21585.jpg
What you see before you is near Noctis Laybrinthus, a crater area, but what I want to show you is the land to the right of the crater. You will see walls that are between 10-30 meters high, and in between them you see a baleen-like structures. This is a city created by tiny aliens. You see that below the baleen structures is nothing but blackness, so I assume that this is a ventilation roof of an underground city. With an environment as harsh and unforgiving as Mars, you want to be underground where the temperature is much more tolerable day in and day out.
Scott C. Waring