Introduction to the Ancient Blockhouse Group: The Suopo Ancient Blockhouse Group contains 176 of the 562 ancient blockhouses in Danba, and is the area with the highest concentration of high-rise blockhouses in the world. The history of human activities in Danba can be traced back to 5,000 years ago. The ancient blockhouses scattered throughout Danba are the best witness to the historical development of the ethnic groups who have lived here.