Source: UNESCO World Heritage
I visited Aachen, Germany in May, 2015 and sent this postcard to myself.
Postcard 2Aachener Dom, Germany. Thanks to Ruth of USA.
Postcard 3 - Aachen - Aken - Aix-la-chapelleAn impressive German catheral. Thanks to Ibrahim.
Postcard 4 - Map of AachenAachen city map. Thanks to DAO of UK for mailing from Belgium.