On Wednesday about 1,000 people gathered to protest against climate change. They all travelled to one spot in London and will be camping there for a week.
The protesters met up in small groups and then had to wait for a text message to find out the location of the top-secret site.
Once they were told where they were going, the protesters headed straight there. Many of them cycled to the camp - you wouldn't catch them using cars to get there!
The protest site was a big secret because organisers didn't want the police to find out where it was and stop it. Once it started they headed there to keep an eye on things.
When they arrived at the camp on Blackheath Common, protesters were told where to set up their tents. Organisers chose the Common because you can see the City of London.
There are around 50 homes next to the Common. Neighbours hope the protesters won't make too much noise.
Protestors set up their banners, none of them showing any fear of heights!
Some protesters took pretty much everything they owned with them - including the kitchen sink!
It's not just adults protesting against climate change, some children are involved too.
The protesters will be hoping it doesn't rain as they're planning to live on the site for a week.