 Another feature is an audio-visual display of Welsh heroes who have made significant contributions to Wales's cultural and political identity, such as the former prime minister David Lloyd George, the fashion designer Laura Ashley and the late rugby player and broadcaster Ray Gravell.Films and exhibits explore the history of Cardiff Bay from the Neolithic era onwards and show how iron ore and coal exports made Cardiff one of the busiest ports in the world.They describe the impact of the coming of railways from 1841, which meant that goods could be transported as far in an hour as they would have been in a month using the canal system.