cathedral of saint maria and markus of reichenau abbey on island of reichenau, lake constance, germany

abbey architecture attraction belfry bell benedictine bodensee building cathedral catholic christianity church clock culture dahlia destination europe european exterior facade famous flowerbed flowers garden german germany heritage historical holiday island lake constance landmark mark markus mary medieval minster monastery old outdoor reichenau religion saint sightseeing summer tourism tower travel unesco maria baden-wuerttemberg