Eldborg is a badass volcanic crater on the Snæfellsnes Peninsula in Iceland. It's like a giant lava pimple that erupted around 5000-6000 years ago, creating a massive, smooth-sided cone with a deep crater. You can hike up to the top for some killer views and maybe spot some ravens chilling in the lava pockets. Just a heads up, it's a bit of a trek to get there, but totally worth it for the epic scenery and unique geological vibes.