Trier is the oldest city in Germany and packed with Roman monuments and sites to see. The city's landmark is the Porta Nigra (Black Gate). Close to the Hauptmarkt there are the Dom (which houses the Holy Robe - on display April 13 to May 13) and the Church of Our Lady. Further ahead are the Imperial Roman Baths and the Evangelical Lutheran Church which are worth viewing. A great day trip and worth the overnight stay to see the sites without the tourist groups early in the morning.