Oregon Caves National Monument is located in South Oregon, near the border with California and it is short drive from Redwood National Park.
The caves were discovered in 1884 and are around 1.5km long, which is quite a lot! The visit is with a ranger, and he/she explains quite a lot of things about the history and formation of the caves. The cave is mostly composed of small galleries, although it also has some big areas.
This part was called the Niagara Falls and it was nice.
This was another large area which was quite beautiful with columns going from the ground to the ceiling.
And this is the most beautiful place in the caves. It is called Paradise Groove and it is really impressive. This banana-like structure is around 5-10 meters high.