As we drove from Tunnel No. 3 to the Dora Observatory, we passed the border crossing that is now closed.
We arrived at the Dora Observatory. From Wikipedia (link),
Dora Observatory is on the South Korean side of the 38th parallel. Situated on top of Dorasan (Mount Dora), the observatory looks across the Demilitarized Zone. It is the part of South Korea closest to the North. Visitors can catch a rare glimpse of the reclusive North Korean state through binoculars, including the North Korean propaganda village situated in the DMZ.