This museum, opened to coincide with the 650th anniversary of the building of Charles Bridge in 1357 (the clever number logo is no coincidence, 135797531. The first stone was laid at 05:31 on 9 July). English texts are available to explain the unique Knights of the Red Cross hospital location, their church and crypt, various bridges; an arch and pillar of the even older (1158 - 1172) Judit Bridge, and others in the region, construction techniques, etc. Charles Bridge, with its statues and history, is the focus but there is so much more. Fascinating.