Hlavní Nádraží, Prague’s main railway station, has a fascinating history and an interesting architectural feature. The station’s original Art Nouveau building, designed by Czech architect Josef Fanta, was completed in 1909 and is renowned for its beautiful, intricate designs. One of the fun facts about Hlavní Nádraží is that it has a secret underground tunnel network, which was built for military purposes during World War II. These tunnels were designed to protect passengers and facilitate the movement of troops and supplies discreetly. Today, the station combines its historic Art Nouveau elements with modern facilities, making it a unique blend of old and new.

Prague Castle, the largest ancient castle in the world, spans over 70,000 square meters. It has been the seat of power for kings of Bohemia, Holy Roman emperors, and presidents of Czechoslovakia. One of the most intriguing features of the castle complex is the "Golden Lane," a picturesque street lined with colorful houses. Legend has it that alchemists once lived there, attempting to create gold and the philosopher's stone under the orders of Emperor Rudolf II. The castle's St. Vitus Cathedral took almost 600 years to complete, beginning in 1344 and finishing in 1929.