The other day, we took Sonia's parents (aka Nana and Grandee) about 2 hours south of Louisville to a place called Mammoth Caves. An amazing place, and as you might guess from the name, they're really big...
We took a guided tour through approx 2 miles of the cave system, but there are over 390 miles of caves discovered, with more being explored all the time. They claim it is the largest underground cave system in the world, and I have no reason to doubt them. Inside, they live up to their name to an even greater extent. There are massive caverns inside, one that stretches some 50 metres high.
The caves also have quite a history. Discovered in 1798, tours started there in 1838 and have had tours go through almost every day since then. They also used to have church services in there in the summer to escape the heat. Once down in the caves, the temperature is always the average temperature of the outside air for the past 10 years. This means that the temperature almost never changes (a steady 12-13 degrees Celcius). So there has to be a significant sustained temperature change for years for the temperature to change at all inside the caves...!
We had a fantastic day there, enjoying an amazing part of God's creation.
