Warm Mineral Springs in North Port, Florida, is a warm-water mineral sinkhole of major geological and archaeological importance. Formed about 30,000 years ago by the collapse of a cavern roof, it preserves evidence from a time when water levels were far lower. Discoveries since the late 1950s included artifacts, human remains, and bones of Pleistocene animals, helping identify some of the oldest known evidence of human occupation in Florida and possibly the oldest known intentional burial in North America. Later archaeological work strengthened efforts to protect the site from looting. The spring also developed as a spa beginning in 1946 and remained in use for decades.