Stara Prochownia (English: The Old Gunpowder Depot) also known as the Bridge Gate (Polish: Brama Mostowa) is a historic building in Warsaw New Town.

The building was initially constructed in 1582 by Queen Anna I of Poland as one of the gates in the city walls of Warsaw.

[1][3] In the 17th century, when the city walls lost their strategical significance in warfare, the gate was converted into a gunpowder depot, which gave its name to the contemporary name.

Following the November Uprising and the Russian decision to erect the Warsaw Citadel, in 1833 the prison had been liquidated and the building was refurbished to become a private house.

[1] In 1994, a plaque was unveiled on the wall of the House of Punishment and Improvement, commemorating the soldiers of the "Dzik" battalion who fought in this place in the Warsaw Uprising.