Create a vertical vintage fantasy travel poster for {argument name="legendary destination" default="Camelot"}, titled as a mythical kingdom destination. The scene shows a grand white medieval castle with many towers, battlements, and teal-green conical roofs, sitting on a rocky green island across a calm lake. Behind the castle is a large pale golden sun or moon disk, with soft lavender sky, long thin white clouds, and layered misty blue-gray mountains in the distance. A stone arched bridge enters from the right side toward the island, reflected faintly in the water. In the foreground, center a dark sword planted upright in a low black stone plinth, standing on a pale cobblestone plaza; frame the lower corners with dark evergreen shrubs and geometric stone benches. Use a clean art-deco travel poster composition, flat vector-like painting, muted pastel palette, crisp silhouettes, subtle grain, cinematic depth, and symmetrical heroic framing. Include exactly 8 visible castle flags: 2 red pennants on the tallest central spire and left tower, and 6 small gold pennants on surrounding towers. Bottom typography: small uppercase tagline reading “EXPLORE WORLDS LIKE THESE IN VISIONARIA, FIRST CINEMATIC IMAGINATION APP.”, then a very large spaced-out title “{argument name="main title text" default="CAMELOT"}”, then a smaller gold subtitle “{argument name="subtitle text" default="THE ETERNAL KINGDOM"}” with tiny decorative diamond dots. Add a small teal-and-gold crown crest centered below the subtitle, flanked by thin gold horizontal rules. No people, no modern objects, no photorealism, no clutter, no extra text.