Qasr Al Watan, Abu Dhabi Presidential Palace
Enter the working presidential palace at Al Ras Al Akhdar, opened to the public as a cultural landmark. The Great Hall sits under a 37-metre dome; the House of Knowledge holds rare manuscripts and scientific works; the Presidential Banquet Hall and the Spirit of Collaboration room show where state business is actually conducted. The architecture and the geometric detail are the point. Allow about ninety minutes, longer if you stay for the evening light show on the facade.