The arched “Devil’s Bridge” is just as magical today as the day it was created back in the late 19th century. In a spectacular optical illusion, the semicircular stone bridge creates the image of a perfect circle when reflected in the lake that runs beneath. Devil’s Bridge, or Rakotzbrücke, is situated in Germany’s Kromlauer Park in the village of Kromlau, near the border with Poland. The village, rich with flora, is also home to the largest rhododendron park in the country. The bridge was commissioned in 1860 by a local knight with the illusion of a circle in mind, was built from rough-cut local stone, and earned its folkloric name from its dubious safety as a pedestrian bridge, according to Atlas Obscura. Yet there is nothing disquieting about the optical illusion. Over a tranquil lake, the image of a perfect stone circle is clear for all to see, and a hotspot for …