The definition of magnificence is splendor and lavishness.
When you go see a world famous, historical hotel and are completely impressed by the richness of the decor, this is an example of being impressed by the magnificence.
Greatness or lavishness of surroundings; splendor.
Grand or imposing beauty.
Richness and splendor, as of furnishings, color, dress, etc.; stately or imposing beauty.