Grand Est · Ardennes, France

Château Fort de Sedan

A mountain of masonry on the Meuse frontier — with some 35,000 m² on seven levels, it claims the title of the largest fortified castle in Europe. Seat of the independent Principality of Sedan until 1642, birthplace of the great Turenne, and a garrison right up to the 20th century.

At a glance

Built: 1424 onwards
Style: Bastioned medieval fortress
Commissioned by: Évrard de La Marck and successors
Signature feature: c. 35,000 m² of fortress on seven levels — Europe's largest by area (as claimed)
The principality: Capital of a sovereign principality until 1642
Famous son: Turenne, Marshal of France, born here in 1611
Today: Museum, panoramic visit — and a hotel within the ramparts
Visiting: Open to visitors year-round