Format: Fillable PDF for paperless classroom or printing with embedded research link.Students will take about 45 minutes to complete the research and reflection questions in this guide." The site includes archaeological remains of three cities and 40 tombs: Wunu Mountain City, Guonei City and Wandu Mountain City, 14 tombs are imperial, 26 of nobles. All belong to the Koguryo culture, named after the dynasty that ruled over parts of northern China and the northern half of the Korean Peninsula fro