At the southern end of Ke Karlovu is a little church with a big name, founded by Charles IV in 1350 and modelled on Charlemagne’s burial chapel in Aachen. In the 16th century it acquired its fabulous ribbed vault, the revolutionary unsupported span of which was attributed by some to witchcraft. From the terrace beyond the church you can see some of Nové Město’s original fortifications, and look out towards ancient Vyšehrad and the modern Nusle Bridge (Nuselský most), which vaults across the valley of the Botič creek, with six lanes of traffic on top and the metro inside.