 The largest find of Iguanodon remains to that date occurred on 28 February 1878 in a coal mine at Bernissart in Belgium , at a depth of 322 m ( 1 @,@ 056 ft ) , when two <unk> , Jules <unk> and Alphonse <unk> , accidentally hit on a skeleton that they initially took for <unk> wood . With the encouragement of Alphonse <unk> , supervisor of mines at nearby <unk> , Louis de <unk> on 15 May 1878 started to excavate the skeletons and in 1882 Louis Dollo reconstructed them . At least 38 Iguanodon individuals were uncovered , most of which were adults . In 1882 , the holotype specimen of I. bernissartensis became one of the first ever dinosaur skeletons mounted for display . It was put together in a chapel at the Palace of Charles of Lorraine using a series of <unk> ropes attached to scaffolding so that a <unk> pose could be achieved during the mounting process . This specimen , along with several others , first opened for public viewing in an inner courtyard of the palace in July 1883 . In 1891 they were moved to the Royal Museum of Natural History , where they are still on display ; nine are displayed as standing mounts , and nineteen more are still in the Museum 's basement . The exhibit makes an impressive display in the Royal Belgian Institute of Natural Sciences , in Brussels . A replica of one of these is on display at the Oxford University Museum of Natural History and at the <unk> Museum in Cambridge . Most of the remains were referred to a new species , I. bernissartensis , a larger and much more robust animal than the English remains had yet revealed , but one specimen was referred to the nebulous , gracile I. mantelli ( now Dollodon <unk> ) . The skeletons were some of the first complete dinosaur skeletons known . Found with the dinosaur skeletons were the remains of plants , fish , and other reptiles , including the <unk> <unk> . 
