Yep, the second one is a cactus. It's a pretty ordinary looking plant really, but this angle made it look really cool.
I am actually from Australia, so it was a trip home to see the family. We took the whole camera kit since my hisband is into photography too. The macro shots I took though were all in the in laws back yard.
Here are a couple more.
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The first one is the handle of a rusty old Hills Hoist. Better know to the rest of you as a clothes line. I live in NY so I don't know if you have these sort in the rest of the country. I'll leave you guessing on the second one.