As the climate crisis begins to dominate the news, we look back at Guardian coverage of pollution since 1869

A look back on modern communism as reported in the Guardian from 1871 to the present day

Following International Women’s Day, we look back on the Guardian’s coverage of women’s fight for equality in the world of politics

We look back on Guardian coverage of the circus and its long tradition - with and without animals

The London Underground, also known as the tube, is the oldest underground system in the world. We look back on reports from its opening in 1863 to the present day

A look back at some of the world’s religious leaders since the beginning of the 20th century, as reported in the Guardian and Observer

We look at Guardian coverage of industrial action and strikes in Britain since the late 19th century

Since the 1947 crash of an unidentified flying object near Roswell, New Mexico, humanity has been transfixed by the idea of life beyond our planet. We look back on the Guardian and Observer coverage of all things alien

Freedom of expression and a liberating lifestyle or objectionable behaviour? We look back on how the Guardian has covered naturism

The UK has long had an intense relationship with its closest neighbour across the Channel. We look back on all things French with coverage of past stories in the Guardian

We look back at the Guardian & Observer coverage of bridges starting with the original report of the inauguration of London’s Tower Bridge in 1894

Despite being the target of censorship throughout history, the pornography industry survives in the digital age

The Thames is England’s longest river and also London’s lifeline. We look back at various events which marked its history since the early 20th century

We look back at the modern sculpture movement generally considered to begin with Auguste Rodin whose work inspired a long line of sculptors

Fifty years ago the Sexual Offences Act 1967 was passed, decriminalising homosexual acts between two men in private over the age of 21. On this anniversary, we look back at the Guardian and Observer coverage of LGBT issues

From Lord Byron to Leonard Cohen, we take a look back at Guardian and Observer coverage of poets and poetry