Between 1966 and 1974, the Prague Stock Exchange, situated near the top of Wenceslas Square, was re-developed as the Federal Parliament with the addition of a massive trussed roof floating above the original structure on enormous pillars.
The new building was designed by the uncompromising Karel Prager – assisted by Jiří Kadeřábek and Jiří Albrecht – to match the monumental proportions of the adjacent neo-renaissance National Museum (Narodní Muzeum).
In 1995, five years after the return of democracy to Czechoslovakia, this functionalist temple became the headquarters of Radio Free Europe. It has since had another makeover as the extension to (and temporary home of) the collections of the National Museum. For a fuller history, see this article from the Prague Daily Monitor