Soon, the concern for accuracy came. Groups of scientists, taxidermists, and artists would go on expeditions to ensure accurate backgrounds and collect specimens, though some would be donated by game hunters. Natural history dioramas reached the peak of their grandeur with the opening of the Akeley Hall of African Mammals in 1936, which featured large animals, such as elephants, surrounded by even larger scenery. Nowadays, various institutions lay different claims to notable dioramas. The Milwaukee Public Museum still displays the world's first diorama, created by Akeley; the American Museum of Natural History, in New York, has what might be the world's largest diorama: a life-size replica of a blue whale; the Biological Museum in Stockholm, Sweden is known for its three dioramas, all created in 1893, and all in original condition; the Powell-Cotton Museum, in Kent, UK, is known for having the world's oldest, unchanged, room-sized diorama, built in 1896.