It's 350 years exactly since the Great Fire of London tore through the city.
To commemorate the conflagration, a 120-metre long recreation of London's 17th-century skyline will be set ablaze on the Thames (near the South Bank Centre) at 8.30pm today – Sunday, September 4. It's going to be impressive.
And for those of you at home, you can watch it livestreamed below...
And if you're joining us mid-fire, here's what it looked like before:
Find out more about London's Burning.