The blackened, ornate tower is the **Katholische Hofkirche** (Dresden Cathedral), a masterpiece of Dresden Baroque. Its dark hue isn't from dirt or fire, but a natural chemical reaction in the local **Elbe sandstone**; the stone’s high iron content oxidizes when exposed to the elements, turning the building into a "living" historical monument. Completed in 1751, it was built by Augustus III in secret. Since Saxony was staunchly Protestant, the Catholic king had to build his place of worship clandestinely, even forgoing a traditional steeple at first to avoid offending the locals. Inside the crypt lies the **heart of Augustus the Strong**, king of Poland and Elector of Saxony. Legend claims his heart beats whenever a beautiful woman passes by. Interestingly, while his heart is here, his body is buried in Krakow, Poland. The church was nearly destroyed during the 1945 firebombing of Dresden but was meticulously reconstructed using original stones—the lighter patches you see are the newer replacement blocks. The blue circular sign with the red "X" and arrows indicates a **total "no stopping" zone** (Anhaltverbot). The arrows point to the start and end of the restricted stretch.