From ancient hideouts to Cold War-era bunkers, explore eight astonishing settlements beneath the Earth’s surface. 1. Burlington https://m.stacker.news/40242 2. Orvieto https://m.stacker.news/40243 3. Derinkuyu https://m.stacker.news/40244 4. Petra https://m.stacker.news/40245 5. Naours https://m.stacker.news/40246 6. Wieliczka Salt Mine https://m.stacker.news/40247 7. Lalibela https://m.stacker.news/40248 2. Orvieto https://m.stacker.news/40249 ...read more at history.com