Château de Vincennes

Twelve minutes from the centre of Paris by Metro line 1, at the eastern edge of the city where the Bois de Vincennes begins, stands a royal castle that most Paris visitors never find. The Château de Vincennes was the primary royal residence of the French monarchy for more than three centuries, before Versailles existed. It contains the tallest medieval keep in France, a 52-metre fortified tower that rises above the suburb of Vincennes like a misplaced rook on an oversized chessboard. Five French kings were born here, one died here, and the site has served successively as a palace, a political prison, an arsenal, and a military archive. It is, by almost any measure, one of the most important medieval buildings in France, and it stands largely empty of visitors on most mornings of the year.

The site had been a royal hunting ground since the 12th century, with modest royal buildings scattered across it. Its transformation into a serious royal fortress began under Charles V, who reigned from 1364 to 1380 and constructed the great keep between 1337 and 1370, beginning the work before his own accession. The keep, the donjon, rises 52 metres across nine storeys, with walls 3.25 metres thick at their base, surrounded by its own moat and a defensive tower at each corner. Charles V used Vincennes as his primary residence, preferring its defensive security to the Louvre, which he considered too exposed for comfort. He died at Vincennes in 1380.

Charles V also began construction of the Sainte-Chapelle in 1379, conceived as a copy of the Sainte-Chapelle on the Île de la Cité, sharing the same flamboyant Gothic tracery and the same ambition to provide a royal chapel of exceptional quality. The Sainte-Chapelle at Vincennes was not completed until 1552, under Henry II, who added the magnificent Renaissance stained glass windows that remain the building's artistic high point. The royal apartments along the south wall of the enclosure, the Pavillon du Roi and Pavillon de la Reine, were added in the 17th century by Louis Le Vau, the same architect who would later design Versailles, for Louis XIV and Anne of Austria.

From the 16th to the 19th century, Vincennes served as a state prison, a role it shared with the Bastille, which stood three kilometres to the west. Unlike the Bastille, Vincennes housed prisoners of distinctly high social standing: the Marquis de Sade, imprisoned under royal lettres de cachet in the 1770s; Nicolas Fouquet, Louis XIV's disgraced finance minister; and the philosophers Diderot and Mirabeau. The cells in the keep were not dungeons in the conventional sense — prisoners were housed in furnished rooms, permitted books, correspondence, and visits from family. Political imprisonment at Vincennes was uncomfortable primarily because of its duration and uncertainty, rather than its physical conditions.

In 1808, Napoleon converted the castle into a military arsenal and barracks, a use it retained for much of the 19th and 20th centuries. The execution of the Duc d'Enghien in the castle moat in 1804, ordered by Napoleon on charges of royalist conspiracy, remains one of the more controversial episodes of the Napoleonic period, and is commemorated with a discreet marker on the site today. The castle suffered serious damage during the Second World War, when retreating German forces demolished several of the defensive towers before withdrawing. Restoration began in the 1950s and continues in stages to the present day.

The keep itself is the primary visitor experience: nine storeys of genuine medieval military architecture, with the upper-floor rooms, including Charles V's private chamber and the former royal treasury, presented today with considerable archaeological rigour rather than romanticised reconstruction. The Sainte-Chapelle provides the artistic counterpoint, its 16th-century apse windows exceptional in quality, and the combination of Gothic structure with Renaissance glazing producing an unusual visual richness rarely found in a single building. Free guided tours in French run daily at set times, and self-guided visits using augmented-reality tablets are available in multiple languages for visitors who prefer to explore independently.