are they near albury i go there every now and then
well my mates mate, doesnt wanna tell, cause there on private property and alot of people try and get in there and rid them, sposingly..
umm guessing by the trees... doesnt even look like its in aus... but maybe in south nsw/north vic
and a way to get them that smooth is to get them really wet
and use the things they use to smooth cement and the stuff in between bricks
umm bricky tool is a trough (trow) and cement stuff is, mortar, but they normally just get quick cement and spread a bit over the top, and hose it, then compact, and it gets hard.
but still, its amazing work