A wonderful site for skydiving would be the tower of the former OMEGA transmitter at Paynesville, Liberia.
According to http://en.wikipedia.org/wiki/Omega_transmitter_Paynesville this tower is still standing and there seems to be no access restriction!
This would it make an ideal site for skydivers!
[B]Whereelse on the world one can find such?
I believe nowhere else![/B]
Of course, Liberia is a dangerous country. But this is also skydiving.
See also: http://wikitravel.org/en/Paynesville