In the eyes of many foreigners, the Great Wall is like a business card to know China. Visitors to Beijing, the choice of scenic spots must also have the Great Wall. In ancient times, the majestic Great Wall, like a great god, defended the land of China. The name of this place is related to the Great Wall, but it has been buried underground for more than 700 years.
In 1938, in the city of bozhou, anhui province, china was first discovered in the military history of china known as the \"underground wall\" channel, which is the famous cao cao road.
Cao Cao Movement Road was built in the late Eastern Han Dynasty, is the Wei Emperor Cao Cao specially built for military needs, since then many dynasties have been used and expanded this underground passage, because it is a military hub, so the past dynasties are confidential.
During the Tang and Song dynasties, the underground military transport road was repaired many times, until the Southern Song Dynasty Jiaxi four years, because the Yellow River decisive mouth Bozhou City was submerged, Cao Cao was silted up, since then buried underground for more than 700 years.
In 1969, in response to the country's call for \"digging holes and building grain in a wide range,\" Bozhou people took part in the construction of underground bomb shelters.
Between 1970 and 1999, a number of state leaders visited and in 2001 officially classified the Cao Cao movement, known as the \"Underground Great Wall,\" as a national key cultural relic conservation unit and then developed as a tourist attraction.
The war road consists of two parts: the Qiaowanglou and the ancient land road. And the city's big corner head as the center, from the green brick built into a passageway to extend to all sides. There are four forms of one-way road, parallel two-way road, upper and lower two-story road and three-dimensional crossing road in the ancient ground road.
One-way street is the main passage to transport soldiers, up to meters to meters, wide meters to meters. At every other distance, the upper end of the passage wall is provided with a square or vertical rectangular niche kan hole for use with oil lamps. Above the top of the ticket is a ventilation hole through the ground, which can be used as a temporary entrance and exit in case of emergency.
The two single lanes, about 3 meters apart, are called parallel double lanes, which extend in the same direction and can be used simultaneously.
There are also remnants of combat in the ancient track, with a variety of military facilities such as cat-ear holes, obstacle tickets, barrier walls, traps, trip boards, command rooms and so on. All sorts of obstacles are cleverly set, among which the voucher is one of the main obstacles in the ancient road, usually set in the one-way street, adopting the method of suddenly reducing the top of the ticket, people who are not familiar with the environment in the road, as long as a little attention, will hit the head blood flow.
According to historical records, the war road was originally used to transport soldiers, to achieve a fast and confidential effect, so called \"troop transport \", and was later developed to send messages and materials and other functions. This originated from the ancient military installations, whether layout or use, everywhere can see the wisdom of the ancients.