For some perspective, check out this page.

You control the slider to change the scale, and the objects start with a coffee bean and go down to a carbon atom.

For a bit more perspective: take a typical pin on a pin cushion. Set the pin cushion in the middle of a domed football stadium on the 50 yard line. Now imagine looking around. If you were able to take just one of the iron atoms from the pin and expand it such that its nucleus was as large as the pin head, the rest of the atom would be close to the size of the stadium. Also, the electrons would still be too small to see.

56 paper clips will give approximately an Avogadro number of iron atom (ignoring the alloyed elements, well–counting them as iron), and that is 6.02 x 10^23 atoms. Remember that a billion is 10^9, and a trillion is 10^12. So, an Avogadro number is nearly a trillion-trillion. We don’t have ways to put that in perspective. (Here is one way to try to deal with large numbers: )

U of U has even more,  for starters.