Albert Dock is the most important attraction in Liverpool and the most visited attraction in Britain besides London. It is the key to understand the history of Liverpool. Albert Wharf was an important port in Liverpool at that time. Before and after the British Industrial Revolution, the import and export trade and slave trade around the world were closely related to this port. Now the old warehouse of the wharf has been transformed into shops, apartments, restaurants, bars, hotels, galleries and museums. The International Slave Museum, Mercy Marine Museum, Liverpool Tate Modern Art Museum and The Beatles Story are all gathered here.