The world's most incredible engineering projects are revisited to uncover why places full of mysteries and untold secrets are now abandoned ruins. S10 E1 Penthouse Palace S10 E2 Castle Kingdom S10 E3 Rock 'N' Roll Island S10 E4 K-Pop Dreamland S10 E5 The True Cross S10 E6 Blues Prison S10 E7 Fake News Fortress S10 E8 Turkish Wonderland S10 E9 The Montauk Conspiracy S10 E10 The ...