The Pioneer Square Historic District is located in downtown Seattle, Washington. It is known for its rich history and well-preserved architecture, featuring buildings from the late 19th century. The area is characterized by its cobblestone streets, brick facades, and unique shops, making it a popular destination for both locals and tourists. Established in the 1970s, the district was designated as a historic landmark to protect its cultural heritage. Key attractions include the Pioneer Square Park, the Smith Tower, and the Seattle Underground Tour, which showcases the city's early history and development.