On the southern part of the site, four long gun-carriage sheds were built in 1802-5 (the northernmost, with offices at either end, designed to accommodate items from the Repository's historic collection). To the north of the sheds, the Rotunda (previously erected at Carlton House to celebrate the peace of 1814) was rebuilt in 1820; it served to house the surviving model collection of the Royal Military Repository (which in the meantime had been on display in the old Academy in the Warren).