The UNESCO WORLD HERITAGE "UPPER MIDDLE RHINE VALLEY" in Germany is only a stone's throw from you. It is surrounded by four international airports.
For example Frankfurt-Hahn-Airport - www.hahn-airport.de - is just 35 min from the Rhine.
Airlines: Ryanair, Wizzair and Icelandexpress... It is Just a cheap and short hop to hahn-airport from London, Manchester, Birmingham, Glasgow, Edinburgh, Dublin, Kerry, Shannon, Reykjavik, Oslo, Gothenburg, Stockholm, Tampere, Mailand, Bologna, Pescara, Venice, Rome, Bratislava, Klagenfurt, Madrid, Sevilla, Santander, Gerona, Porto, Faro, Hamburg Lübeck, Berlin...
Other airports:
Düsseldorf in the north. www.duesseldorf-international.de
Airlines: e.g. Air Berlin
Cologne in the north. www.flughafen-koeln-bonn.de
Airlines: e.g. Air Berlin, Germanwings
Frankfurt in the east. www.airportcity-frankfurt.de
Airlines: eg. Lufthansa, British Airways, Scandinavian Airlines
From the airports take the bus or train to Koblenz, Mainz, Boppard, Rüdesheim or Bingen on the rhine. Or you just hire a car to explore the rhine-region.