Fort Corchaug Archaeological Site in Cutchogue preserves the remains of a Native American log fort and rare evidence of 17th-century contact between Indigenous people and Europeans on eastern Long Island. Associated with the Corchaug, identified here as part of the Montaukett, the fort may have been built as a defensive refuge after Narragansett attacks and the effects of smallpox forced the abandonment of land on the South Fork. One of the few undisturbed Native American fortified village sites in the Northeast, it was investigated by archaeologist Ralph Solecki and designated a National Historic Landmark in 1999. The site lies within the 105-acre Downs Farm Preserve.