The pipe like object, was discovered in Amargosa Valley, near Mount Sharp on the red planet.
Credit for discovery: Rami Bar Ilan
Nasa Source: http://gigapan.com/gigapans/162484
And about this one?
A photograph snapped by mars curiosity rover, appears to show a Martian weapon of some kind. The anomaly, which resembles an anti aircraft gun, clearly has a defined body and a large tube like object pointing toward the sky.
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