The Natural History Museum's blue whale skeleton is suspended from the ceiling in Hintze Hall. It is 25.2 metres long.
Find out more about the specimen's history: http://www.nhm.ac.uk/discover/wexford-blue-whale.html
A printable 1:50 scale model is available for download! Click 'Download 3D Model', then choose 'Additional files'. Supported and unsupported STL files included, each section will fit on an Elegoo Mars, Anycubic Photon or similar.