SS Great Britain is a museum ship and former passenger steamship that was advanced for her time. The largest passenger ship in the world from 1845 to 1853, she was designed by Isambard Kingdom Brunel (1806–1859), for the Great Western Steamship Company's transatlantic service between Bristol and New York City. While other ships had previously been built of iron or equipped with a screw propeller, Great Britain was the first to combine these features in a large ocean-going ship, making her one of the most technologically advanced ships of her time. She was the first iron steamer to cross the Atlantic Ocean, which she did in 1845, in 14 days.