Beelitz Heilstätten is a spooky abandoned hospital in Germany with a dark past. Built in 1898, it served as a sanatorium for lung diseases and later as a field hospital during WWI and WWII. It even treated a young Adolf Hitler! Now, the complex is mostly deserted, decaying back into the forest. Urban explorers used to flock here until it got a makeover with a canopy pathway in 2015. Now it's a tourist attraction, but still retains its eerie charm.