Rock 'N' Roll Island

E1

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.

Penthouse Palace

E2

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

Castle Kingdom

E3

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.

Fake News Fortress

E4

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

The True Cross

E5

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

Wonderland

E6

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

K-Pop Dreamland

E7

Exploring Yongma Land - a South Korean dreamland given a second life from the most unlikely of places.

Blues Prison

E8

Exploring Old Joliet Prison, a battered facility near Chicago that descended into open war, but then hosted the Blues Brothers!