Season 11 - Episode Guide

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.

Exploring Haludovo Palace Hotel in Croatia, Wolf's Lair, a German military complex and Herouni Mirror Radio Telescope - a pioneering facility in Armenia.

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.

Exploring Dover Commando Fortress in South East England, where traces of a top-secret Commando raid are still visible.

Exploring Old Byron Hot Springs in the Californian desert - a once glittering Hollywood hotspot, converted into a top-secret interrogation centre.

Exploring a symbol of national pride that became a symbol of excess in the Turkish capital of Ankara.

Yongma Land is a South Korean dreamland given a second life from the most unlikely of places; Saguramo Space Research Centre is a state-of-the-art facility that thrust the Georgian nation into the world's greatest race; Donnottar Castle is an ancient Scottish fortress besieged by a warrior that would inspire a Hollywood epic; and Nis Concentration Camp is a Balkan house of horrors that symbolised the worst of humanity.

This episode features Old Joliet Prison, a battered facility near Chicago that hosted the Blues Brothers; Tito's Nuclear Bunker, Keelung Fortifications and Vilarinho de Furna Campo Do Geres.

A dilapidated facility near Chicago that descended into open war but then hosted an iconic pop-culture moment; a vast underground base in Bosnia, saved by an act of sabotage, committed by a double agent; an ancient Portuguese settlement crushed under a wave of change, now emerging from the mud like a modern-day Atlantis; and a fortress city in Taiwan that a famed Chinese commander used to trap his French enemy and turn into their coffin.