Unlock Tate Britain’s history and architectural secrets in our Architecture Tour. Surviving both war and flood damage and built on the site of the former Millbank prison, explore the rich history and architecture of Tate Britain . Learn about the construction and design of Tate Britain from nineteenth-century neo-classicism, the postmodern extension of the Clore Gallery and the transformation of the oldest part of our Grade II listed building through the Millbank Project.