Season 11
01. Rock 'N' Roll Island
Exploring Air Studios, on the Island of Montserrat, that became a mecca for rock legends. Also Tskaltubo, in Georgia, built to host a fearsome dictator.
02. Penthouse Palace
Exploring Haludovo Palace Hotel in Croatia, Wolf's Lair, a German military complex and Herouni Mirror Radio Telescope - a pioneering facility in Armenia.
03. Castle Kingdom
Exploring a theme park in Buenos Aires built in a time of terror and dogged by controversy, and a jaw-dropping collection of castles in Turkey.
04. Fake News Fortress
Exploring Dover Commando Fortress in South East England, where traces of a top-secret Commando raid are still visible.
05. The True Cross
Exploring Old Byron Hot Springs in the Californian desert - a once glittering Hollywood hotspot, converted into a top-secret interrogation centre.
06. Wonderland
A symbol of national pride that became a symbol of excess in the Turkish capital of Ankara.
07. K-Pop Dreamland
Exploring Yongma Land - a South Korean dreamland given a second life from the most unlikely of places.
08. Blues Prison
Exploring Old Joliet Prison, a battered facility near Chicago that descended into open war, but then hosted the Blues Brothers!