五角場位於上海市楊浦區，全稱“江灣-五角場”，為上海四大城市副中心之一，其南部地塊為上海十大商業中心之一，因於上海市區東北角的邯鄲路、四平路、黃興路、翔殷路、淞滬路五條發散型大道的交匯處而得名。五角場最初規劃自民國時期南京政府為打破上海租界垄斷城市中心局面而實行的“大上海計劃”，現整體分為三大板塊，即南部商業中心、中部知識創新中心和北部商務中心。

The Pentagon can go inside, but it needs to make an appointment in advance. Many scenic spots in the United States offer an appointment service. If it's not your turn to make an appointment, the Pentagon needs to look down from a high place to see the overall effect.

五角大樓其實沒有太多可看，但是五角大樓外的911遇難者凳狀紀念碑還是有一點意思的

This event, including a visit to the Pentagon, is actually one of the reasons that attracted me to travel to the eastern part of the United States. The Pentagon is located in Arlington County, Virginia, not far from DC. The command center, which was set up over a year after the Pearl Harbor Incident of World War II in response to the war, has gradually become the Department of Defense of the United States and the mysterious power center in many movies and TV dramas. This opportunity to enter this mysterious place, in fact, the Pentagon is open to visitors, but must be booked and approved. When the appointed day arrives and passes the security check, the visitor enters the waiting area. The whole process can only be photographed in the waiting area. A mock-up platform is set up here for visitors to remember, as well as souvenir shops. Later, you will be visited by men and women soldiers from both sea and land. A special tour route will be set up. The focus will be on the history of the four U.S. military services. The memorial to General Eisenhower and the memory of 184 people killed in the 911 attack on the Pentagon will be seen, including one passenger and crew member on United Airlines Flight 77. A special memorial facility was set up in the building, with words and pictures recording the lives of each deceased person. Soldiers who lead tourists walk in front of the team and backward to ensure they are always facing tourists. There are many restaurants and shops in the building to meet the needs of more than 20,000 staff members every day.

Visited the 911 Memorial Park of the Pentagon. A monument was erected for 184 deceased persons. The parallel line on the ground was the route of the plane's dive at that time. The Trident in the distance is the height of the plane's dive. On one side of the Pentagon you can still see the difference between the old and the new. Light-colored stones are walls that have been repaired after impact. Very shocked!

The Pentagon is the office building of the U.S. Department of Defense, located in Arlington County, Virginia, southwest of Washington. It is named for its pentagonal shape and is the largest single administrative building in the world. No visitors are allowed, only a circle around the outside parking lot is allowed.