Tivoli was the idea of a Danish man called Georg Carstensen. He had travelled around Europe and seen how much people loved fun gardens with music and games. He asked the king if he could build something similar in Copenhagen. The king said yes, and Tivoli opened in August 1843.
The oldest rollercoaster at Tivoli is called Rutschebanen - 'The Wooden Coaster'. It was built in 1914 and is still running today. A real person rides on each train as a brakeman, pulling levers to slow it down on the steep bits. It is one of only a handful of wooden rollercoasters in the world that still works this way.
Tivoli is famous for its lights. When the sun goes down, hundreds of thousands of little lights switch on in the trees, the flower beds and along the lake. There are concerts on the open-air stage, jugglers, dancers and a marching band of children in red uniforms called the Tivoli Boys Guard.
Walt Disney - the man who made Disneyland - visited Tivoli in the 1950s. He loved it. He took notes about the lights, the gardens, the kindness of the staff and how clean everything was. Many people say Disneyland was inspired by Tivoli. So when you go on a Disney ride anywhere in the world, a tiny bit of Denmark is in there too.