This is an impressive building that begs to be admired. The domes make a fascinating landmark to the city and the architecture is incredible. The marble interior is magnificent. Definitely try seeing a show here because the glass curtain with the volcanic mountain scenery alone is wonderful. I love theatres but this one is fabulous. It is brilliant to wander around outside also. Do cross the road and take time to admire the interior of the old Post Office opposite which houses the first elevator in Mexico City.