Prague's most complete Art Nouveau building, completed in 1912, stands at the end of the Royal Route where a royal court once stood. Every interior surface is decorated — mosaics, stained glass, gilded plasterwork, and murals by Alphonse Mucha and other leading Czech artists of the period. The mosaic on the facade, "Homage to Prague," is Mucha's work.
Inside: the Smetana Concert Hall, two café spaces (the French and the American), restaurants, and several decorated salons available for hire. The guided tour is worthwhile for the rooms that are otherwise off-limits. The street-level Kavárna (café) is a fine place for coffee; it is less tourist-blasted than nearby cafes and the interior is genuinely spectacular.