Built in the 14th century by Charles V, the Chateau is one of the most important castles in French history. The Sainte-Chapelle (Holy Chapel), on site was founded in 1379 and is well worth a visit. The chapel construction started just before the death of Charles V in 1380, was inaugurated only in 1552 under the reign of Henry II, after a long interruption of the building work starting at the beginning of 15th century. The Sainte-Chapelle of Vincennes was intended to house part of the relics of the Passion, like the chapel of the Palais de la Cité in Paris. Pack a picnic lunch and explore all the history here.
Don't have enough time to get out of Paris, but want to walk the grounds of a medieval French fortress which isn't swamped with tourists, then this is the place to be. Situated in the 12 arrondissement of eastern Paris, this 13th century palace contains all the features one would want to see in a fort. From it's high walls and fully protected moat to its dungeon and chapel, this was once the residence of (Saint) Louis IX.
The chateau can be directly accessed from the Metro yellow line 1 and the grounds themselves are freely open for visitors to parade about. Tickets are available for purchase to visit the museum and exhibits within the buildings.