Wales' history and culture also attract tourists. The Museum of Welsh Life, which focuses largely on the industrial past of Wales, is currently the most popular tourist attraction in Wales, attracting over 600,000 visitors annually. The scars of the industrial revolution and Wales' industrial heritage can still be seen on parts of the Welsh landscape today. Many other places of historical interest attract large numbers of tourists: for example the many castles, such as Caernarfon Castle and Caerphilly Castle—most of them built to enable or to consolidate the English conquest of Wales, during the reign of the English king Edward I.