The Palace of the Parliament in Bucharest is the second largest building in the world and houses the Romanian Parliament. Several castles in Romania such as Bran Castle and Corvin Castle are associated with Vlad Țepeș, known as Prince Impaler, who temporarily gained independence from the Ottoman Empire. Voroneț and Arbore monasteries contain vibrant murals depicting biblical stories. Sarmizegetusa Regia was an important religious and political center for the ancient Dacian civilization. The Berca Mud Volcanoes and various caves like Bears Cave and Scărișoara Cave contain unique geological formations. The Danube River flows through Romania from west to east and the Danube Delta contains a