Cologne

Hi, can anyone tell me about worth to see places close to Cologne? maybe Luxemburg, Belgium or inside Germany,considering traveling costs.

Thanks

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Düsseldorf

http://www.duesseldorf-tourismus.de/

Bonn

bonn.de/tourismus_kultur_sport_freizeit/…

esp. the house of history (free entrance)

http://www.hdg.de/indexeng.html

Brühl Castle

bruehl.de/stadt_bruehl/…schloss_aug_uk.htm

http://www.schloss-bruehl.de *)

Middle Rhine Valley *)

http://www.talderloreley.de/index.en.php

http://www.welterbe-mittelrheintal.de/

Aachen (cathedral *))

aachen.de/EN/…index.html

Rout of Industrial Heritage (Zollverein pit *))

route-industriekultur.de/steuer/…menue_e.htm

*) UNESCO world heritage sites