Ji'an (集安; Jí'ān)is a city in Jilin province.
Changchun - 7 hours; ¥107
Goguryeo Ancient sites Haotaiwang Stele, the General's Tomb (AKA as Tomb of Ran Mou), and Cemetery of the Noblemen at Yushan are all fairly close to each other (within a kilometer or two). A short taxi ride to Wandu Mountain would take ten or so minutes. Most of the tombs look like big mounds of grass or rocks.). 8:30AM to 4:00PM. 100RMB for a ticket to see all four sites, individual tickets are 30RMB.
North Korea - separated by Yalu river, North Korea is just a stone's throw away from Ji'an. Take a boat ride down the river, watch the sunrise over the North Korean mountains, etc