While stromatolites might sound like something belonging in a cave, these ‘living fossils’ grow in the water at Hamelin Pool. Rock-like in appearance, they’re actually alive, and reveal what life might have been like 3.5-billion years ago. Remarkably, this is the world’s most abundant colony of them. It’s just one of the natural allures of the state’s World Heritage listed Shark Bay, which is also characterised by Shell Beach, formed from billions of coquina bivalve shells, and fabled Monkey Mia.