360º HD panorama from Mars.
You’ll have to go to http://www.panoramas.dk/mars/greeley-haven.html to see it in full glory. This dinky little picture doesn’t do it justice.
Seriously, it’s worth it.
UPDATE: OK, for like the 5th time this week I’ve posted something and then found out later that it wasn’t what it said it was. These images are from the old rover (Opportunity) not the new one (Curiosity). Still amazing, but just for accuracy’s sake, I wanted to make that clear.