Season 11

1. 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.

2023-05-15 • 44 min

2. 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.

2023-05-22 • 44 min

3. 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.

2023-05-29 • 44 min

4. Fake News Fortress

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

2023-06-05 • 44 min

5. The True Cross

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

2023-06-12 • 43 min

6. Wonderland

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

2023-06-19 • 44 min

7. K-Pop Dreamland

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

2023-06-26 • 44 min

8. Blues Prison

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

2023-07-03 • 44 min