Which French palace is the epitome of Baroque architecture?

The Palace of Versailles is widely regarded as the epitome of French Baroque architecture.

Versailles began as a hunting lodge for Louis XIII in 1624, but Louis XIV transformed it into a monumental royal residence from 1661 onward. Louis Le Vau expanded the buildings, Charles Le Brun directed much of the lavish interior decoration, and André Le Nôtre designed the formal gardens as an architectural extension of royal power.

The palace’s Hall of Mirrors, built largely between 1678 and 1684, became the defining image of the complex. Monumental façades, controlled symmetry, gilded interiors, sculpture, fountains, and geometrically ordered gardens expressed the authority and magnificence of the Sun King.

Strictly speaking, French Baroque is often called French Classicism because it favors balance and regularity more than the theatrical curves of Italian Baroque. Even so, Versailles is the standard example and inspired palace architecture across Europe, including Peterhof in Russia.