Huangyaguan Great Wall: Huangyaguan Great Wall is located in the vast mountainous area in the north of Jixian County, Tianjin, east to Malanguan in Zunhua County, Hebei Province, and west to Jiangjun Pass in Pinggu, Beijing. It is a part of the ancient Great Wall in China, with 66 towers, namely 52 enemy towers and 14 beacon towers. This is a military location in JD.COM. According to historical records, the Huangyaguan Great Wall was built in the seventh year of Tianbao in the Northern Qi Dynasty, that is, in 557 AD, with a history of 1400 years. Since the Qin and Han Dynasties, the famous Xiongguan has been a battleground for military strategists in past dynasties. The whole Great Wall was originally built of gravel. In the second year of Qin Long in Ming Dynasty, Qi Jiguang was transferred to Yuji Town as the company commander. Seeing that the whole Great Wall was unstable, he wrote to the imperial court that it was covered with a layer of bricks, so it was called a brick-covering overhaul. The Great Wall we see now is made of bricks in the Ming Dynasty. The entire Huangyaguan Great Wall is 4 1 km long, and the entire Huangyaguan Great Wall is a very solid defense system. In the farthest place of Guancheng, there is a circular sentry tower named Phoenix Tower on the hill in Lianghuali. It is the tallest circular sentry tower along the Great Wall of China and the first line of defense of Huangyaguan Great Wall. When the time comes, you can be a lookout or you can fight independently. The second line of defense of Huangyaguan Great Wall is the main wall of the Great Wall, which is thick and easy to defend but difficult to attack. The third line of defense is a very mysterious Bagua City in Guancheng. Through these three lines of defense, Huangyaguan has the potential of "one person defends it, and ten thousand people cannot force it".
Tianjin Baxianshan National Nature Reserve: 30 kilometers northeast of Jixian County, located in the center of Beijing, Tianjin, Tang and Chengde, with the resplendent Qing Dongling in the east, the magnificent Huangyaguan Great Wall in the west, the rippling Jade Lake in the south and Wuling Mountain in the north. It is the highest terrain in Tianjin and the place where peaks gather. There are 65438+ peaks over 900 meters. The Eight Immortals Mountain was originally named "Eight Immortals Table". According to legend, eight scattered immortals, including Tie Guai Li, roamed the East China Sea and were attracted by the wonderful peaks, canyons, secluded forests and misty waters here, so they got off Xiangyun and had a picnic next to a huge stone two meters square. Later, people called this huge stone the "Eight Immortals Table", hence the name "Eight Immortals Mountain". Baxianshan National Nature Reserve is a treasure house of many kinds of animals and plants, with green peaks, deep valleys and gurgling streams, and is known as the "green kingdom". Here, the trees are majestic, the bushes are overgrown and the vegetation is lush. Over the years, due to the inconvenient transportation and the fact that this area is a forbidden area of the Qing Dongling, it has been closed for 280 years and is inaccessible, so it is "hidden in the boudoir". In recent years, after investigation and demonstration by experts, it has been confirmed as a rare natural secondary broad-leaved forest area in North China and even at the same latitude of the earth, with a quite typical forest ecosystem. 1995 1 1 the State Council Letter (1995) 108 approved the establishment of "Tianjin Baxianshan National Nature Reserve".