To the outsider, Mysore is almost synonymous with the Mysore palace. The erstwhile seat of the Kingdom of Mysore, this palace is a grand architectural wonder, built with a mix of Indo-European styles. The palace houses a plethora of majestic and exquisitely designed halls, passages, corridors, and courtyards - each revealing one layer of grandeur after another. The typical day trip takes you through 24 places within the palace premises. Even a very cursory roundabout through it will at least take three hours, and if you are particularly interested in history or architecture, way more than that.
Here is an overview of this grandeur from a trip to Mysore a few months back.
The stately entrance to the Mysore gate is the first sign of what lies inside.