The City is known for its Danish colonial architecture, building structure and history. Dozens of streets and places throughout the City have Danish names. Charlotte Amalie has buildings of historical importance including St. Thomas Synagogue, the second-oldest continually practicing synagogue in the Western Hemisphere, and Frederick Lutheran Church. The Town has a long history of pirates, especially myths of Bluebeard, and facts and stories of Blackbeard (Edward Teach). In the 17th century, the Danes built both Blackbeard's Castle and Bluebeard's Castle attributed to the pirates. Blackbeard's Castle is a U.S. National Historic Landmark. Another tourist attraction is Fort Christian, the oldest standing structure in the Virgin Islands Archipelago. A copy of the Liberty Bell and freed slave blowing a conch shell are in Emancipation Park, which is both a source of national pride and a tourist attraction.