빛나는 산호 아치가 있는 수중 도시 레트로 포스터

Retro travel advertisement for 'The Sunken Kingdom of Lumina'. An underwater city with bioluminescent coral structures and majestic, spectral manta rays swimming through grand archways. The poster features bold, 1950s-style typography and a vibrant, yet slightly muted color palette. Inspired by vintage travel posters and the aesthetic of dark fantasy horror.