Panmunjeom (판문점) is also called the 'Truce Village' because it is where the armistice for the Korean War was negotiated. It contains the Joint Security Area (the only place where North Korea and South Korea armed forces stand face-to-face at the DMZ), the Bridge of No Return and other significant places.
The original Panmunjeom village was destroyed in the war and lies on the DMZ. The southern side of the village is mostly restored and the name of Panmunjeom is now mistakenly used coincide with the Joint Security Area (JSA).
The Joint Security Area has held many interactions between the North and the South.
The blue buildings you see in the picture are where the Military Armistice Commission (MAC) and the United Nations Command (UNC) would be when meeting with the North Koreans because the buildings are built right at the DMZ.
The Bridge of No Return was a bridge between North Korea and South Korea to exchange prisoners captured at the end of the war. Prisoners were given the choice of either to stay in the country where they were captured or return home. Once decided the prisoner can never be allowed to return, hence the name. After the Military Demarcation Line (MDL) was clearly marked to never be crossed, North Korea had no way of going to the JSA so they built a new bridge leading from the north in 72 hours. The bridge is called '72 Hour Bridge'.
Tourists are able to enter the DMZ from various tourism companies and the United Service Organization (USO), but they must sign a document that states clearly "The visit to the Joint Security Area at Panmunjom will entail entry into a hostile area and possibility of injury or death as a direct result of enemy action." South and North Koreans are not allowed on tours and background checks may be required if the tourists are from Russia or China.
We didn't get to go in the DMZ because we aren't on a tour, but we shall keep that in mind for next time!