We were there: the Guardian’s most memorable journalism over 200 years

The Guardian has published more than 5m pieces of journalism since 1821. With the help of staff, readers, supporters and alumni we pick 200 of the most powerful, and ask Guardian staff past and present to reflect on their enduring appeal. Day one: investigations, from Wikileaks to Snowden

• Celebrate 200 years of independent Guardian journalism, and help power our future - make a contribution, or become a subscriber