Czechia's Incredible 1960s Supervillain-Lair Hotel (And Why Its Architect Got Banned By The Regime)

In 1973, a new hotel opened outside the city of Liberec, in what was then Czechoslovakia. And it looked like nothing anyone had seen before. So what's it like inside? How did it win one of the biggest prizes in architecture? And why was its designer banned from the official opening? I travelled to Liberec to find out more...