Vintage poster of a luminous fantasy city in ancient trees

Vintage travel poster for 'Aethelgard: The City of Whispering Spires', a breathtaking city built atop colossal ancient trees, connected by glowing luminescent bridges, under a sky with two luminous moons. Bold, art deco lettering proclaims the destination. Style is classic vintage travel posters with an ethereal digital painting aesthetic, inspired by the works of Frank Lloyd Wright for architectural grandeur and the celestial dreamscapes of Moebius. Vivid colors and dramatic lighting create a sense of wonder and advanced civilization.