This site has links to many sites about museums and tombs of Korea and the three ancient kingdoms.
Anak Tomb #3
Deokhwari Tomb #2
The General’s Tomb
Tomb of the Wrestlers (Gakjeochong)
Tomb of the Dancers (Muyongchong)
Ohoe (Wukui) Tomb #4
Ohoe (Wukui) Tomb #5
Note Ji’an is in Jilin Province in China
From this link
Tomb of the Wrestlers, 5th cent. A.D.
Ji’an city, Jilin province, China
The construction of Gakjeochong’s ceiling is the typical octagonal corbelled dome. Goguryeo astronomical ceilings are a mixture of mythological and symbolic motifs, constellations, stars, and planets. Although most of the Gakjeochong ceiling is taken up with scrolling cloud motifs, there are at least three constellations1 to be seen in the north, south, and southwest respectively2. There is a heavily damaged sun crow in the east, and a moon toad (closeup) in the west.
The constellations are represented as circles (stars) joined by one or more lines; three lines in this tomb, one line in Deokheungri.
2Recall that on astronomical ceilings north and south are reversed, since we are looking up at the heavens rather than down at the earth. In this photo the bottom is north, the top is south, east is right, and west is left.