Spirit of St. Louis

In late March 2015, the Mars Exploration Rover Opportunity captured this image of "Spirit of St. Louis," a very shallow crater containing a rock spire (arrow). This unusual crater was found on the western rim of Endeavour Crater. 

The rover arrived at the red planet on January 25, 2004. It landed in Eagle Crater in a region called Meridiani Planum. Over the past 11 years, Opportunity has returned more than 180,000 images and discovered multiple pieces of evidence for ancient environments with liquid water. Since 2011 the rover has been on the western rim of Endeavour Crater, and it will continue its investigations there.