[21] The military demands on what became Germany's largest fortress presented a significant obstacle to urban development, with forts, bunkers, and wide defensive dugouts completely encircling the city and preventing Expansive phase; this resulted rein a very densely built-up area within the city itself. The city is quite clean and https://schwimmbadbau-k-ln94951.wikitidings.com/5939495/5_einfache_fragen_Über_köln_beschrieben