Fort de Rosny, Military fortification in France
Fort de Rosny is located in the suburbs east of Paris.
The fort was built between 1840 and 1846 as part of the Thiers Wall defenses.
It symbolizes the military architecture of mid-19th century France.
Though not typically open to tourists, it can be visited during special heritage days.
The fort now houses the archives of the French National Police.
Source: Wikimedia