Trier: Visit Germany’s oldest city with its eight UNESCO World Heritage sites: Porta Nigra, Cathedral, Church of Our Lady, Roman Throne Room (Basilika), Amphitheater, Imperial Baths, Barbara Baths, and Roman Bridge.
http://www.trier-info.de/english
Luxembourg: Luxembourg is always worth a trip. You really must have a look at the casemates, some of the longest subterranean passages under the old fortress.
http://www.lcto.lu/en
Bitburg: The Bitburg Brand Adventure World, the Cascade adventure swimming pool in Bitburg: Fun and more for young of all ages.
http://www.eifel-direkt.de
Eifel: The maars (volcanic lakes), the Manderscheid castles, Eltz Castle, the Nuremburg Ring, and much, much more. There’s much to see and experience in the Eifel.
http://www.eifel.info