Historical Sites Washington D.C., the capital of the United States, is rich in history and offers numerous historical sites that provide insights into the nation's past. Pioneer Square Nestled in the heart of Seattle, Washington, Pioneer Square is an iconic and historic neighborhood that offers a unique glimpse into the city's rich past. Known as "The Mother of All Cities" due to its status as Seattle's original downtown core, Pioneer Square was established on the shoreline of Elliot Bay following Seattle's Great Fire in 1889. Klondike Gold Rush National Historical Park The Klondike Gold Rus