1. The “Airport”
The following picture
and its computer enhancement were taken by Mariner 9. Ever since,
the strange formation, which exhibits structural elements,
including rectilinearity and other regular geometric designs, has
been dubbed the “Airport” for its resemblance to a modern airport
terminal.
Mariner 9, # 4209, of the “Airport” on Mars. Location 1.9°
S 186.4°W

Computer Enhancement of The Mariner 9
Airport

It is conceivable
that some sort of geological process could account for such a
formation. But as will be seen, if this is the case then Mars is
home to a variety of geological processes of a very exotic nature,
since there are so many disparate types of anomalies to account
for.