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 and Icelandexpress... It is Just a cheap and short hop to hahn-airport from London, Glasgow, Edinburgh, Dublin, Kerry, Reykjavik, Oslo, Gothenburg, Stockholm, Tampere, Mailand, Bologna, Pescara, Venice, Rome, Madrid, Sevilla, Santander, Gerona, Porto, Faro...
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.