HiRISE 3D: The Western Side of Hecates Tholus Caldera
Hecates Tholus is a volcano that likely erupted hundreds of millions of years ago, which created a caldera on its western flank.
https://www.uahirise.org/anaglyph/ESP_036101_2120_ESP_043156_2120_RED
NASA/JPL-Caltech/UArizona