Cologne Round 2, Part 5: Remnants of the Roman North Gate
Not only is Cologne Germany's fourth largest city, it's one of the country's oldest as well. It was founded as "Colonia" by Romans in 50AD, and a considerable amount of Roman ruins can still be found in the city today. The remnants of the Roman north gate are a perfect example of such ruins. Just outside the massive Kölner Dom, one can find foundations and a single side arch, all that remains of the original Roman gate to the city.