The building where the Louisiana Purchase transfer was signed in 1803. Spanish colonial government building (1799), now a Louisiana State Museum covering the city's layered colonial history — French, Spanish, and early American periods. Architecture, artifacts, and documents trace how three empires shaped this place.
Location
French Quarter, New Orleans
Map
Insider Intel
Start on the first floor with the colonial period galleries — the Spanish period is often overlooked but explains the city's architecture and legal system. The second floor covers the Louisiana Purchase and early statehood. The third floor Napoleon death mask is oddly compelling. Allocate 90 minutes.
Weekday mornings. The building is on Jackson Square, so combine with a square visit. The Cabildo and Presbytere (across the square) are both Louisiana State Museum buildings; a combination ticket covers both if you want the full picture.
Built under Spanish rule in 1799 to house the city government (the Cabildo was the Spanish governing council). The Louisiana Purchase transfer ceremony happened in the Sala Capitular on December 20, 1803 — this is where Spain officially ceded Louisiana to France, and France immediately transferred it to the United States. The building burned in 1988, was meticulously restored, and reopened in 1994. The wrought-iron balcony was added in the 1840s. Essential for understanding that New Orleans is not just French.