HOW DID THEY BUILD THAT?

8PM, SMITHSONIAN ★★★ Among the jaw-dropping buildings in this new series is 56 Leonard Street (left) in Manhattan, and among those explaining them are the engineer Ellie Cosgrave. She has a hilariously awkward accident with a Jenga set in the process. (Freeview 57, Freesat 175, Sky 171, Virgin 276)