I was in France last week and visited the Lascaux Caves to see the drawings. It wasn't until we got there that I found out that the Caves and rock art on display were built and painted in 1983 and the original is not open to the public!!
Personally I felt ripped off. The reproduction was all very impressive, but it's 20th century AD not 20th Century BC. I would feel the same about a new Stonehenge. It doesn't seem so fascinating when you know how, when and who it was built by. What's the point? £10Million? Do me a favour...