Beneath the quiet town of Wieliczka, Poland, lies one of the most extraordinary underground creations in human history. Stretching for over 180 miles, the Wieliczka Salt Mine holds chapels carved entirely from salt, a vast cathedral, and even an underground lake once sailed upon by visitors. For centuries, it has drawn kings, scientists, and artists into its shadowy depths.But not everything has remained on display. Sealed-off shafts, hidden monuments, and forgotten sculptures have been rediscovered in recent decades—remnants of a working mine that also became a place of faith, devotion, and artistry. From the world’s largest underground chapel to a forgotten salt obelisk for an emperor, this is the story of the Wieliczka Salt Mine’s lost wonders and why they still captivate today.