The ruins of a once-palatial compound contain the secrets of one of history's most notorious criminals.
1) Hacienda La Manuela, Guatapé, Colombia;
2) The Zeppelin Bunker, Wünsdorf, Germany;
3) Sao Domingos Mine, Alentejo, Portugal;
4) Denge Sound Mirrors, Dungeness Peninsular, Kent, UK
