Crystal Palace Dinosaurs listed buildings from 1973, extensively restored in 2002, and upgraded to Grade I listed in 2007. The models represent fifteen genera of extinct animals, not all dinosaurs. They are from a wide range of geological ages, and include true dinosaurs, ichthyosaurs, and plesiosaurs mainly from the Mesozoic era, and some mammals from the more recent Cenozoic era. Following the closure of the Great Exhibition in October 1851, Joseph Paxton's Crystal Palace was bought and moved to Penge Place atop Sydenham Hill, South London by the newly formed Crystal Palace Company. The grounds that surrounded it were then extensively renovated and
Architecture of London of cast-iron and plate glass which opened in 1851. Before that, iron was already being used to gird the roofs of the King's Library in the British Museum, built between 1823–27, the Reform Club (1837–41), Travellers Club (1832), and the new Palace of Westminster. The technological advancements pioneered with the Crystal Palace would be applied to the building of London's great railway termini in the latter half of the century: St. Pancras, Liverpool Street station, Paddington, King's Cross, and Victoria. King's Cross was a relative latecomer; built in 1851 to support incoming traffic for the Crystal Palace exhibition, its arched