With Cologne's RheinEnergieStadion set to host games at UEFA Euro 2024 in Germany, get clued up on the stadium and the city in our guides.

Germany Inside Out - Cologne - Germany's oldest major city Cologne - Germany's oldest major city Cologne was founded by the Romans as a colony and was made a city in 50 AD.

The city, when it's mentioned, often seems an adjunct of Cologne Cathedral, which took some six centuries to complete, as work proceeded intermittently. (For 400 years a crane sat on the ...