So close to heaven: the Speyer Cathedral is the largest Romanesque church in the world. The cathedral has been on the list of UNESCO World Heritage Sites since 1981.
Originally commissioned by the Salian Emperor Conrad II, the cathedral was meant to be the longest church in the world. It was not completed, however, until more than thirty years later by Emperor Henry IV. The total length of the Episcopal cathedral is 135 metres. A special feature of the masterpiece are its two organs. The most recent of them was only completed in 2008. The large main organ has 5.496 pipes. The oldest part of the cathedral, the crypt, is an absolute must-see.