Not really, tho there's sort of double decker-stuff on Rousay like http://www.themodernantiquarian.com/site/398/taversoe_tuick.html & in the South of France http://www.themodernantiquarian.com/site/10498/dolmen_1_de_costeclaude.html

Not sure they're really similar to the one you're talking about tho....

love

Moth