- What to Expect - In the oldest part of the Hofburg Imperial Palace, you’ll find a collection of jewels and treasures collected by the Habsburgs over 800 years. With 21 rooms full of crowns, necklaces, swords, gems, and more, this is one of the world’s most important treasures.Here, you can see stunning royal items like the Imperial Crown of the Holy Roman Empire, scepters, orbs, and jewel-encrusted crowns. These treasures are not only beautiful but full of history.The collection includes rare items like robes, swords, and even a “unicorn horn” (which may actually be a narwhal tusk). Every piece tells a story of royal power and luxury.Perfect for history lovers and those who appreciate fine objects, the visit takes less than three hours, so you’ll have plenty of time to explore more of Vienna.