Your first stop is not the tower
Goseong Unification Observatory offers views toward the northern coastline and mountains from a controlled-access border area in Gangwon. It is not a normal drive-up viewpoint: the official first stop is the Tongil Security Park registration office, 481 Geumgangsan-ro, Hyeonnae-myeon, Goseong. The observatory car park is at 455 Tongiljeonmangdae-ro, a different address. Follow registration and ticketing instructions before proceeding.
The October and November cutoffs differ
The official timetable sets the latest departure from the registration office at 16:50 from March 1 to July 14 and August 21 to October 31; 17:50 from July 15 to August 20; and 15:50 from November 1 through the following February 28. This is not the time you should reach the tower: you must arrive at the registration office before its final departure.
Budget and a final check
Official individual tickets cost KRW 3,000 for adults and KRW 1,500 for seniors or students. Parking is charged separately, listed at KRW 5,000 for vehicles with up to 10 seats. The center estimates 1–1.5 hours for the visit. On the day, check weather or security restrictions with the operator at 033-682-0088 before leaving.