One day in Köln, Germany

• Things to do in Köln, Germany · 40 places to see, led by Cologne Cathedral and Wallraf–Richartz Museum

• Aachen63 km awayAachen Cathedral6 stops in a day, starting at Ludwig Forum für Internationale Kunst
• Koblenz78 km awayEltz Castle6 stops in a day, starting at Emperor William Memorial at Deutsches Eck
• Trier133 km awayCathedral of Trier6 stops in a day, starting at Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier UNESCO World Heritage Site
• Essen58 km awayZollverein Coal Mine Industrial Complex31 places to see, led by Zollverein Coal Mine Industrial Complex and Museum Folkwang

• Cologne Cathedral: Thomas Wolf, CC BY-SA 3.0 de
• Museum Ludwig: Thomas Robbin, CC BY-SA 3.0
• Romano-Germanic Museum: Raimond Spekking, CC BY-SA 4.0
• Fragrance Museum: Raimond Spekking, CC BY-SA 4.0
• Wallraf–Richartz Museum: http://www.reserv-a-rt.de, CC BY-SA 3.0
• Schokoladenmuseum Köln: Arminia, CC BY-SA 3.0

Pictures from Wikimedia Commons, through each place’s Wikidata entry.

• Each day starts at the best-known place not yet seen and adds the best known within a short walk of it, then puts them in the shortest order. The places come from Wikidata (CC0), ranked by how many Wikipedias have an article about them.
• The map draws each day’s walk along the streets, routed by Valhalla on OpenStreetMap; the distances beside the stops are straight lines.
• Opening hours, tickets and closures are not checked: each place’s Wikipedia article has them.