Beauvais Cathedral was the most ambitious cathedral building project in France. Construction began in 1247 and the aim was to build nothing less than the largest church with the highest vault. Unfortunately, construction technology was not yet advanced enough. The towering choir was finished in 1275 and partially collapsed in 1284. The vaults, which were then built with no less ambition, reached 48.5 metres and are the highest Gothic cathedral vaults ever. Instead of a nave, the highest tower in the world was built over the crossing, 153 metres high. It was completed in 1569 and was the highest building in the world for four years, then the tower collapsed too. After that, money and Gothic architecture ran out and the church remained a gigantic torso. A slated wall closes off the church behind the crossing to the planned nave; the comparatively tiny Romanesque nave still stands here. This is probably how Cologne Cathedral looked before further construction in the 19th century. You enter the church through the wonderful south façade with its magnificent carved doors, past a statue of Peter, which is a replica of Peter in St. Peter's Basilica in Rome, and are overwhelmed by the feeling of space. The vault rises infinitely high, huge, bright windows bathe the room in bright light. The blue of the windows in the chapel ring of the apse glows mysteriously. Between the enormous pillars of the transept, powerful wooden auxiliary structures support the sensitive statics (which have now held for 700 years). Interestingly, the crossing pillars are different: one pillar, which may have survived the tower's collapse, has the familiar, diversely sharply contoured Gothic appearance, three pillars have distinctly round profiles. We are lucky enough to experience a baptism service and see the church "in operation". But it is a space of peace and contemplation: only a few visitors find their way to this building, which makes it all the more impressive. And there is another marvel that amazes visitors: a tower-sized astronomical clock from the 19th century, which displays an almost incalculable variety of astronomical data on numerous, beautifully designed dials.