Cologne

Cologne Cathedral took an almost unbelievable 632 years to complete. Construction began in 1248, progressed for roughly three centuries, then stalled almost entirely starting in the 1500s — for nearly 400 years, one of the towers sat visibly unfinished with the original medieval construction crane still perched on top, a genuine landmark of its own that Cologne residents lived alongside for generations before work ever resumed. Construction only restarted in the 19th century, guided by a set of original medieval plans that had, by sheer chance, survived intact, and the cathedral was finally finished in 1880 — now one of the largest Gothic churches on earth and a UNESCO World Heritage Site.

That cathedral anchors an Old Town that was almost entirely rebuilt after suffering catastrophic destruction in World War II — over 90% of the historic center was destroyed, and much of what stands today is a careful postwar reconstruction, making the cathedral's survival (heavily damaged but still standing amid the ruins) feel even more significant in retrospect.

Cologne's beer culture is genuinely distinct rather than a general German stereotype: Kölsch, a light, crisp style of beer, is legally protected to be brewed only within Cologne and its immediate surroundings, and it's served in small, narrow glasses that servers keep replacing automatically round after round — the only way to stop the flow is to place a beer coaster on top of your empty glass, a real, functioning local custom rather than a tourist gimmick.

The Hohenzollern Bridge, crossing the Rhine near the cathedral, has become an unofficial local tradition of its own: thousands of padlocks, left by couples as a symbol of commitment, now cover entire sections of the pedestrian railings, dense enough that the bridge has had to be structurally monitored for the added weight.

Cologne and nearby Düsseldorf share a long-standing, good-natured rivalry, partly expressed through their competing local beers (Kölsch versus Düsseldorf's darker Altbier), and the two cities — half an hour apart by train — are easy to combine into a single trip covering both Rhineland identities.