An exhibition at DC’s National Building Museum features facsimiles, by “Lego master” Adam Reed Tucker, of such icons as the Empire State Building, Dubai’s Burj Khalifa, the Gateway Arch, Fallingwater, and Calatrava’s never-built Chicago Spire. “The Lego brick … [is] the perfect toy for the age in which it was introduced, which helps explain why Tucker’s models have a cultural power that ordinary architectural models might not.”