Create a square poster that captures the essence of travel excitement through a dynamic composition featuring an airplane soaring through a vibrant sky, a sleek bus navigating a bustling city street, and a modern train speeding along a scenic route. The artistic style should blend realism with surrealism, showcasing intricate details of each vehicle while incorporating dreamlike elements such as exaggerated colors and whimsical clouds. Use dramatic spotlighting to highlight the airplane, soft natural light for the bus, and ambient light for the train, creating a harmonious balance. The background should include a lively airport scene, a colorful urban landscape, and picturesque countryside, all seamlessly integrated. Focus on the textures of the vehicles, the expressions of excited passengers, and the movement of the scene. Enhance the image with HDR effects for depth, vibrant color grading to evoke energy, and subtle lens flares to add a modern touch.