Panmunjom is a cluster of blue buildings where the two Koreas have own liaison offices on each side

US President Donald Trump held talks with North Korean leader Kim Jong Un in the Demilitarised Zone (DMZ) between the two Koreas on Sunday, the third meeting between the two leaders in just over a year.

The world's last Cold War frontier has seen a spate of dramatic diplomatic and military incidents over the years, as well as dozens of rounds of government, military and humanitarian talks since 1971, when the two Koreas opened their first hotline and liaison offices.

Most infamously, axe-wielding North Korean soldiers in the DMZ in 1976 murdered two American soldiers who were cutting down a poplar tree to secure a clear view.

Following are some facts about the 250 km-long DMZ, which separates North and South Korea.