Source: UNESCO World Heritage
I visited Koln Cathedral and sent this postcard to myself.
Postcard 2- Multi-ViewI have visited Koln Cathedral in May 2015. Great postcard showing interior and exterior views of cathedral. Thanks to Deike of Germany.
Postcard 3 - Koln City ViewCologne (Koln) on Rhine River.Koln am Rhein Stadtpanorama. Thanks to Vanda.