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- 1Scotland's Sin CityApril 23, 2007 · 9.0
- 2Hitler's Underground LairApril 30, 2007 · 8.7
- 3Rome's Hidden EmpireMay 7, 2007 · 8.5
- 4Catacombs of DeathMay 14, 2007 · 8.5
- 5City of Caves Budapest, HungaryMay 21, 2007 · 8.5
- 6New YorkJune 4, 2007 · 8.5
- 7London's Lost Cities London, EnglandJune 11, 2007 · 9.0
- 8Beneath VesuviusJune 18, 2007 · 9.0
- 9Freemason UndergroundJune 25, 2007 · 9.0
- 10Dracula's Underground Bucharest, RomaniaJuly 9, 2007 · 8.5
- 11Secret Pagan UndergroundJuly 16, 2007 · 8.8
- 12Underground BootleggersJuly 23, 2007 · 8.7
- 13Rome The RiseJuly 30, 2007 · 8.5