Marx is the rolls royce of playsets, having gone from their hey day in the 1950s and 1960s, they still had a little fight left in them by the mid seventies. While miles away from their former glory, they were cranking out a toy that delivered hours of play in a little box.
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AKA Brian Heiler author of "Rack Toys: Cheap, Crazed Playthings" and co-editor of "Toy-Ventures Magazine". Co-Host of the "Pod Stallions" podcast. Host of the Brick Mantooth Youtube channel, painter, designer, writer, mental health advocate, toy collector, Mego, and Mego Knock-Off enthusiast. I have large feet, ADHD and I live in Canada. Talk toys, not others. 
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I always envied these playsets, wishing they made 'em Mego-sized. But as cool as they seemed, I just couldn't get into figures that didn't move. It felt like I would have been just setting up some sort of diorama.
Looking at them now, i still wished them made 'em Mego-sized 🙂
That Navarone mountain looks mighty similar to the Matchbox Mobile Action Command mountain from behind.
I really really wanted that Navarone. I went to the house of a rich kid once and he had one. Man it was a great day.