This is actually a part of the Rhino and Lion Nature Reserve on the outskirts of Pretoria and Johannesburg. It is also penned as the "most nicely decorated cave in South Africa."Everybody naturally goes to the Sterkfontein Caves, which are a part of the Cradle of Humankind museum. However, I would recommend a trip to Wonder Caves, as they are truly breathtaking structures that are still being preserved to continue their natural processes, so much so that fines for touching the stalagmite/stalactite structures run into the thousands!
Whilst we waited to join the next tour, we had lunch outside, where we could watch the vultures perched on the electric poles that dotted the landscape. There was also an indifferent ostrich pecking about, and my siblings had fun trying to get as close as possible to the two warthogs waddling about.
The entrance into the cave is quite a steep decline, so wear sturdy shoes. Our guide churned out all the rules that most people ignore, but you may be interested in the part about killer bat droppings. At the bottom of the stairs, we were squeezed into a cage-like lift. The lights were dimmed and we were awed. The magnificence and sheer size of these natural wonders had most of us wide-eyed.
We were led around the cave and informed of the stalactite and stalagmite creation process. The caves also have a 'dark' side in that miners used to work there by candlelight. Hard to imagine but when the guide turned out all the lights and lit a few candles the severity and consequences hit home very quickly.
As an educational trip for the whole family and a day outing, I would definitely recommend the Wonder Caves.