1. Rock 'N' Roll Island

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. 15 May 2023. 44 min

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.

2. Penthouse Palace

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. 22 May 2023. 44 min

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

3. Castle Kingdom

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. 29 May 2023. 44 min

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.

4. Fake News Fortress

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. 5 June 2023. 44 min

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

5. The True Cross

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. 12 June 2023. 43 min

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

6. Wonderland

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. 19 June 2023. 44 min

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

7. K-Pop Dreamland

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. 26 June 2023. 44 min

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

8. Blues Prison

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. 3 July 2023. 44 min

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