I wonder if there is a way to extract vertex coordinates from polygon or SierpinskiCurve which are obtained by using the Graphics command? For example
`Graphics[SierpinskiCurve[2]]`, which produce:
[![enter image description here](https://i.stack.imgur.com/5Zph3.png)](https://i.stack.imgur.com/5Zph3.png)

I know I can right click at those images, choose get coordinates, and check the coordinate one by one by moving the cursor to each vertex. But I wonder if there is a better way to do this? I would like to just get a list of vertex coordinates instead of clicking at each vertex one by one.