3703978 The Camel House. London Zoo, 1928 (b/w photo) by Bond, Frederick William (1887-1942); Zoological Society of London; (add.info.: The Clock Tower is the earliest extant building in the Zoo. Designed by Decimus Burton in 1828 for llamas, in 1831 a clock was added to the top of the building, and the llamas were replaced with camels.); by Zoological Society of London ; British, out of copyright.