Here are the locations for each room:

1844 Room - Buckingham Palace
Pavillon de Flore - Palais du Louvre
At The Top - Burj Khalifa
Poets’ Corner - Westminster Abbey
Indian Hall - Monticello
Oval Office - White House
Room of Requirement - Hogwarts
1812 Military Gallery - Winter Palace
Hall of Mirrors - Palace of Versailles
USA Hall of Heroes - Pentagon