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
Sydenham from London Bridge to West Croydon, opening in 1839. After the railway opened potential gas companies began to consider the Sydenham area with the Crystal Palace and District Gas Company having works at Bell Green, which continued production until 1969; a retail park now occupies most of the site. In 1851 the Great Exhibition in Hyde Park was housed in an immense glass building, called the Crystal Palace. In 1854 the building was bought by a private company, dismantled and re-erected in Sydenham Park (now called Crystal Palace Park). Exhibitions, concerts, conferences and sporting events were held at the Crystal