Thanks Dan. I guess I should have qualified my question with 'man-made'
There are dozens of these things around these parts.
Here's a couple more of the same structure.
I find it very humbling to stand next to something like this, knowing it has been there for hundreds of years and will be there well after we have all gone.
Matt
On a lighter note. May I tag on a question here?
Having set up my posting I usually press Preview - take a look at my effort - and then Post
For the last few weeks I am never able to connect to the Preview screen. I wait a few minutes and then press Post and it goes ahead.
Problem my end or....?