The term 'Lorraine Capital' refers to the city of Metz, which is located in the Lorraine region of France. Metz is the capital of the Lorraine region and has a population of around 125, 000 people. It is known for its Gothic architecture, including the Saint-Étienne Cathedral, which is one of the largest Gothic churches in Europe. Metz is also home to the Centre Pompidou-Metz, a modern art museum.