Season 11

01 Rock 'N' Roll Island Episode 115th May 2023 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 Episode 222nd May 2023 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 Episode 329th May 2023 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 Episode 45th June 2023 Exploring Dover Commando Fortress in South East England, where traces of a top-secret Commando raid are still visible. 05 The True Cross Episode 512th June 2023 Exploring Old Byron Hot Springs in the Californian desert - a once glittering Hollywood hotspot, converted into a top-secret interrogation centre. 06 Wonderland Episode 619th June 2023 A symbol of national pride that became a symbol of excess in the Turkish capital of Ankara. 07 K-Pop Dreamland Episode 726th June 2023 Exploring Yongma Land - a South Korean dreamland given a second life from the most unlikely of places. 08 Blues Prison Episode 83rd July 2023 Exploring Old Joliet Prison, a battered facility near Chicago that descended into open war, but then hosted the Blues Brothers!