Charles Bridge. This is the Malostransky bridge towers, located, as is obvious from the name, from the Mala Strana area.
These towers were built at different times. The lower one (it is hardly visible in the photo) was originally Romanesque, and in 1591 it was rebuilt in the Renaissance style. The higher one was built in 1464.
Of course there is a tower and at the other end of the bridge it was called the Old Town Bridge Tower. For a long time these towers were the only decoration of the bridge, but during the Baroque period the bridge was decorated with various sculptures