Brattahlíð was Erik the Red's estate in Greenland, established in the 10th century. It was located in a sheltered spot at the head of Tunulliarfik Fjord, where Erik and his descendants lived until the mid-15th century. The site includes Thjodhild's church, possibly the first European church in the Americas, and well-preserved farm buildings. Brattahlíð's disappearance in the 15th century is attributed to factors like cooling temperatures, soil erosion, and competition from the Inuit. Today, visitors can explore the reconstructed chapel and longhouse, as well as the remnants of the once-thriving Norse settlement.