If you ever visited the Smithsonian Museum of Natural History in Washington D.C. sometime before 2015 and visited their fossil hall, you will have come face to face with a series of six large murals by palaeoartist Jay Matternes, showing different stages in the evolution of mammals. For nearly five decades, these were part of various exhibits until they were dismantled in 2014-2015. Unfortunately, I have never had the opportunity to visit the museum. But, luckily for me, Smithsonian Books has now published Visions of Lost Worlds, a beautifully produced love letter to Matternes’s palaeoart. Written by the museum’s Curator of Dinosauria Matthew T. Carano and director Kirk R. Johnson, in close collaboration with Matternes himself, this large-format art book offers an unparalleled look at these murals and the artistic process of making them.