I thought I'd get in early for this week's Sepia Saturday theme, which is expositions. This is the 1951 Festival of Britain, held in London on the South Bank of the Thames and still fondly remembered as the symbolic end of post-war economic austerity. The 'Dome of Discovery' on the left and the 'Skylon' tower, both demolished after the festival. Looking closer you can see a group of school boys watched over by a stern teacher and two policemen.
A bit of trivia: one of the consulting engineers on the Dome was Oleg Kerensky, son of former revolutionary Russian Prime Minister, Alexander Kerensky.
For another photo on the theme of expositions see this one I posted a while back.