The Great Barrier Reef may be one of the seven natural wonders of the world, but Australia’s got another natural wonder that might even be more spectacular. Located in Western Australia is a lake that looks as if it’s been filled to the brim with Pepto-Bismol. The out-of-this-world body of water—named Lake Hillier—might seem man-made and even toxic, but its bubblegum pink color is actually all-natural. Scientists have studied its composition, and, so far, they’ve attributed the pink color mostly to an algae that produces a reddish beta-Carotene in salty waters. Lake Hillier is off-limits to visitors but you can swim in other pink lakes nearby.