Yakutsk is a Russian port city on the Lena River, in east Siberia. It’s home to the Mammoth Museum, with millennia-old fossils of woolly mammoths. The Melnikov Permafrost Institute Underground Laboratory has a tunnel showcasing fossils, including a mammoth calf, in below-freezing temperatures. The Yakut State Museum of History and Culture of the Northern Peoples houses Ice Age fossils, including mammoths and rhinos.