Normally you'd be gutted if you saw your school project going up in flames, but for kids at a school in Berkshire, that's what they'd planned all along.
See what the model city looked like before the fire took hold.
After spending all term making a model of London as it was in the 1600s, pupils stood back to watch their teachers set it on fire.
It might seem crazy, but it was all part of their history lessons about the Great Fire of London in 1666.
It's hoped the fire will help pupils to remember more about the topic.
The Great Fire of London broke out at a bakery in Pudding Lane in 1666, destroying huge parts of the city.
Teachers said they got pupils to recreate the scene of the blaze to see just how quickly fire can destroy things that take a long time to build.
Teacher Susan Row at the school in Wokingham said it was something the children would never forget: "It's the biggest lesson you can give children about the dangers of fire."