There are more experimental class aircraft in the USA than any other. That being said, what type of requirements does an experimental aircraft have to meet?
Also, are there ways around certain regulations? For example, the guy in the picture below was battling with the FAA so they would let him fly his jet pack in the USA over the grand canyon, which they originally said no to, but they eventually let him - is this because he is "famous" and therefore has less rules he needs to follow?