Create a square poster that captures the essence of travel excitement through a dynamic composition featuring an airplane soaring through a bright blue 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 digital art, showcasing intricate details of each vehicle while incorporating vibrant colors and abstract elements. Use natural light to illuminate the airplane, creating a sense of freedom and adventure, while the bus is bathed in the warm glow of the city, and the train glides through a picturesque landscape. The background should include a lively airport scene, a colorful urban landscape, and rolling hills, 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. Include the text "Adventure Awaits: Your Journey Starts Here" in a bold, modern font at the bottom of the poster.