Kevin McCloud travels the country to uncover the stories behind the buildings Britain has chosen to protect at the very highest level. Across England, Scotland and Wales, he looks at more than twenty Grade I and Category A landmarks, from a Victorian fairy‑tale castle to a bombed cathedral whose ruins were deliberately left standing. With rare access and his sleeves rolled up, Kevin helps repair a dinosaur at Crystal Palace, raises Tower Bridge, and climbs inside the Lovell Telescope at Jodrell Bank. 

Along the way, the series asks a deeper question: why did we save these buildings, and which ones might we one day regret losing?