The world's most incredible engineering projects are revisited to uncover why places full of mysteries and untold secrets are now abandoned ruins. 1. Derelict Housing of Protest 2. The Beached Leviathan 3. Desolation of Ponte City 4. Bangkok's Ghost Tower 5. Ruins of the Nazi Resort 6. Romanian Royal Desolation 7. Ruins of the Zoo Fortress 8. Hidden Hell of Angel Island 9. Ghos...