In brief
The building, gardens and square are parts of a common Baroque ensemble.
Useful to know
The Würzburg residence is an 18th-century palace complex associated with the princes bishops of the Schönborn family. UNESCO points to the participation of an international circle of artists, including architect Balthazar Neumann and artist Giovanni Battista Tiepolo. The entry also includes the court gardens and the Residenceplatz. [1]
For architectural reading, trace the transition from the open space to the building. The representative effect does not begin only at the front door: the square, volume and interior spaces are perceived consistently. It's an analytical way of observing the ensemble.
Do not attribute the whole complex to one profession or to one author. The palace combines architecture, painting and landscape layout. Distinguishing these contributions allows for a more accurate explanation than the general "rich decoration". It also shows why the photo of the facade is only part of the history of the place.
Sources
For further detail and to check the information: