You wouldn't want to lose your keys in the Royal Palace of Madrid; with over 3,000 opulent rooms, it's Europe's biggest palace, and easily one of the most lavish too. Explore this palatial residence with a fast-track ticket for jaw-dropping views of stately galleries and intricate rooms that housed some of Europe's most enigmatic royals. See the Crown Room, then walk down the halls with a regal demeanor. Inspect the weapons armory and contemplate the masterpieces in the painting galleries.