Lost History Unbuilt 1846 Proposed Design for Smithsonian Castle Sep 4, 2014 What a fascinating old drawing from 1846. This is the proposed design for the Smithsonian Castle, Proposed design for Smithsonian Institution Building by John Notman, north front elevation. It is a Gothic design with three stories, a central tower/cupola, crenellated embattlements, and symmetrical wings. The design was submitted for the competition sponsored by the Building Committee of the Board of Regents, December 23, 1846 Source: Smithsonian Archives Ghosts of DC via EmailWant to get our great content sent to you by email? Sign up here and we'll stay in touch!