The Old Town Bridge Tower is one of the most beautiful Gothic gateways in the world. The tower, along with the Charles Bridge, was built by Emperor Charles IV according to designs by Petr Parléř in the mid-14 th century. The gate to the Old Town was also conceived as a symbolic victory arch through which Czech kings passed on their coronation processions. For an unforgettable view, visitors must climb 138 steps to the viewing gallery.
Source : https://www.prague.eu