Propaganda: Power & Persuasion. Until 17 September, £9, British Library

This engrossing exhibition looks at international state propaganda from the 20th and 21st centuries. Some are innocuous, such as Potato Pete from the second world war, although some are more dark – like a mask of Hitler on a young person as a message from President Roosevelt.

Life and Death in Pompeii and Herculaneum. Until 29 September, £15, British Museum

In AD 79, the explosion of Mount Vesuvius covered two cities in the Bay of Naples in a cloak of ash. Rediscovering them almost 1,700 years later provided a fascinating insight into life under the Roman Empire. The exhibition shows streets, homes and living spaces before the famous volcano blew its top.

Poster Art 150. Until 27 October, entry included in price of admission, London Transport Museum

Everybody's favourite mode of transport turned 150 this year, and London Transport Museum has put on a range of exhibitions for the anniversary. One includes this groundbreaking poster exhibition, which showcases 150 of the most interesting poster art of the famous London Underground.