Longwood

Longwood is the biggest unfinished house in America — Haller Nutt's 1860 octagon, Samuel Sloan's Oriental Revival design, 32 rooms and a Moorish dome on a 30,000-square-foot footprint, and the upper floors that were never finished because the Civil War took the Northern craftsmen home. The family lived in the basement for sixty years.

Nutt was the cotton king who hedged wrong — the Egypto-Mexican hybrid strain developer, 42,000 acres, 800 enslaved workers, $3 million fortune, and a Unionist who kept building with Northern labor while Mississippi seceded. The war stopped the work; the debt and the pneumonia killed him in 1864; the house stood as Nutt's Folly — the largest octagon house in America, nine basement rooms finished out of thirty-two.

The house is the antebellum dream's skeleton — the octagon's geometry intact, the dome on, the first floor finished in its Moorish detail, and the upper floors bare brick where the plasterers never came back. The file keeps the folly's completeness: the ambition that was too big for the war, the basement the family lived in, and the octagon that stands as the South's most perfect unfinished statement.

Longwood is the archive's folly file — Nutt's octagon, the largest in America, unfinished since 1861, the basement-lived mansion that's the antebellum dream arrested mid-construction.