Hundreds of feet below a Russian city is something so trippy and mind-blowing, it’s hard to believe it’s actually real. What was once a salt mine is now an insanely colorful, psychedelic underground cave, an effect caused by many natural layers of mineral carnallite. Carnallite creates swirls on the colored rock,ranging from yellow to white to bold blues and reds. It turns an average old salt mine into a site of particular interest for potential tourists, but unfortunately, it’s also totally off limits without permission from the Russian government. Luckily, we’ve got photos of the mine below.