On the fourth day, venture beyond Metz to explore its surroundings. Take a day trip to the charming village of Rodemack, known for its well-preserved medieval architecture. Explore the narrow streets, visit the castle ruins, and enjoy panoramic views of the surrounding countryside. Afterward, head to the nearby city of Nancy, famous for its stunning Place Stanislas. Admire the grand square, visit the Musée des Beaux-Arts, and indulge in some delicious local cuisine.