The BBC will be covering World War One in great detail over the next four years. They've already started, with podcasts, interactive guides, online courses, programs new and old plus much, much more. Perhaps it's best to start at the beginning, with Professor Margaret MacMillan's Countdown to World War One (podcast link) or the account of her fellow historian Christopher Clark, Month of Madness. Of course, how the war started is still contested by historians, as recounted in The Great War of Words. The latter two are also part of the main WWI podcast. Or you can dive into the Music and Culture section, go through an A-Z guide or look at comics drawn by modern cartoonists.
Revolutions is a new weekly podcast by Mike Duncan, who is best known for the History of Rome podcast, though he also writes comics. There are two episodes so far of Revolutions, a short introduction to the series and one on Charles Stuart, king of England.
Punch Cartoons has over 8000 cartoons from the pages of Punch, the long-running British satirical magazine. It cast its eye on everything from quintessentially British entertainment to children's books to computer games to optometrists. Punch ran from 1841 to 1992 and was relaunched in 1996 and finally closed shop in 2002. You can read up on the history of the magazine on their website and if you want to read some old issues to see what they were like, Project Gutenberg has quite a few. [Punch previously]
The political cartoons of Clifford K. Berryman lampooned American politics from the era of Grover Cleveland to the Truman administration. If he's known today it's mostly for having originated the teddy bear. While some of his cartoons have scant relevance today, many remain surprisingly relevant. Of the many historical events he drew there are women's suffrage, the 1948 election and the 1912 Republican primaries between Taft and Roosevelt.