Junior Banks' Fortress of Faith (Greenback Castle)

Greenback Castle is a hand-built castle environment in East Tennessee. According to the SPACES Archives, Floyd 'Junior' Banks began building it in 1993, at age 46, and the walls rose from salvaged materials: demolition surplus, donations and concrete mix that suppliers saved for him. Fred Scruton's photographic folio describes the walls as made almost entirely by Banks working alone, and Unearth the Voyage reported in 2026 that he worked without blueprints, diagrams or formal construction training.

SPACES describes six cinder-block mural towers joined by walls roughly sixteen feet high, with some twenty mostly open-air themed rooms along them and a pet cemetery where about twenty-five dogs are buried under handmade concrete markers. Banks estimated that he had spent less than $2,000 on the structure at the time of that entry. Scruton writes that most rooms are open to the sky and none is habitable, and that Banks believes divine messages appear in the textures of his concrete work. Scruton's folio classes the site as mixed secular and religious, and Unearth the Voyage describes crosses and scriptural references as part of the site.