Cologne, Germany: Roman Arch

When you get to the big cathedral in Cologne, it's easy not to look around and just stare at the huge building. So, here's a tip - check out the surroundings.

You'll see this arch watching over the proceedings - just as it has been doing for centuries. It dates back to Roman times, and is part of a wall that once went all the way around the city. Reportedly, the foundation for this arch is still intact underground and can be seen in the parking garage and in an excavation area.

You have to appreciate stuff that's built to last.

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