All his life Markham was a constant traveller and a prolific writer, his works including histories, travel accounts and biographies. He authored many papers and reports for the RGS, and did much editing and translation work for the Hakluyt Society, of which he also became president in 1890. He received public and academic honours, and was recognised as a major influence on the discipline of geography, although it was acknowledged that much of his work was based on enthusiasm rather than scholarship. Among the geographical features bearing his name is Antarctica's Mount Markham, named after him by Scott in 1902.