The caves are located in Abercrave in the Swansea valley. I went here recently, and enjoyed the day.

At first I thought the admission charges  were a bit expensive, but you get to see quite a lot for your money.

There are three caves to visit, the Dan yr Ogof cave, a winding cave with beautiful formations accentuated by colourful lighting.

Cathedral cave, a massive cave discovered in 1963 which is brought to life by modern lighting and dramatic music.