Forty thousand children from around the world are enjoying the 21st World Scout Jamboree, which is being hosted by the United Kingdom this year.
This year's event - in Essex in the south east of England - is really special because it marks 100 years since the Scout Association was formed.
Adam went to check out the jamboree, visiting the campsites and having a go at some of the activities on offer.
The 12-day jamboree was opened by Prince William on Saturday.
The Scouting Movement was set up by a man called Robert Baden Powell in 1907, with the first camp held in Dorset.
There are LOADS of Scouts
At 8am on Wednesday, a special ceremony is being held at the jamboree to remember the moment when it all started.
The Scouts are sleeping in mini-camps, with their own cooking facilities and tents of all shapes and sizes.
They told Adam that they were having a brilliant time.
"The best thing about being in the Scouts is that you get to play lots of games," said one.
Adam met kids from across the world at the jamboree, chatting to Scouts from America, Finland, Italy and Mexico among other countries.
Scout celebrations are being held throughout the year - check out the index on the right to find out more about the organisation.