I found a font that is only remotely similar: Bricklayer an amateur font from many years ago.
I would love to see anything closer.
UPDATE
I also found a font called Bricks, which is very similar to Bricklayer.
Don

More "bricks" http://www.fontspace.com/category/brick but nothing at all similar to the Inca building stones.
Don

Part way there, but apparently not a font There is a flat version as a font http://www.dafont.com/minecrafter.font but does not have the building stone effect.
Don

Part way there, but too mechanical/industrial and not a scalable font http://www.handmadefont.com/shop/propaganda-font/
Looks like the Incas are keeping their secret...
Don

I would bet somewhere in one of Dan X. Solo’s exotic alphabets there is something like that.
In my cursory search, decorative typefaces visually inspired by stone tend to presents each letter as carved from a single piece (albeit often crumbling) instead of composed by blocks, while those composed by bricks tend to have a very flat and clean cut.
Regarding the 3D aspect, one I found, not at all similar, but somewhat as much monumental, is http://www.fontspace.com/manfred-klein/mk-typobricks-rough
Another search term could be “block”, example: http://www.fontspace.com/crolrene/wodenbloks
Lastly, a place where the concept has been explored is certainly Fontstruct. Unfortunately its content isn’t easy to navigate and filter.
Two samples which could or could not be of interest to you:
http://fontstruct.com/fontstructions/show/levelrebel
http://fontstruct.com/fontstructions/show/brickybrickbold

Oh, and about non scalable fonts, you could be interested in this:
http://www.visualnews.com/2012/06/11/stylish-typography-made-of-cement-b...

Nothing spectacular: Megalithic, Crown Decay, Brick City, Cobblestones, Rock Steady, Rock, Clayborn. Blambot, Pizzadude and ComicCraft collections may provide few more.

Ryuk’s mention of comic book fonts made me hoping someone somewhere created a fan font out of the iconic vintage Hulk logotype:

If someone did, I had no luck finding it.
Rock Steady remains the closest I’ve seen.

From Dafont:
http://www.dafont.com/stonehenge-loboloco.font
http://www.dafont.com/rh-brickhaus-proto.font

Thanks Riccardo and Ryuk for the interesting answers.
The concrete blocks photos are good. Could be the basis of an interesting font.
Same for The Incredible Hulk lettering.
As for the existing scalable fonts:
Rock Steady by the excellent comic book lettering artist, Nate Piekos, has an appropriate treatment for the face. Could be applied to other face designs, including the polygonal stones used by the Incas. Could be extended to the 3D treatment. I agree that his company, Blambot, and the other comic book company, ComicCraft are the most likely places for finding something in this genre. Perhaps also PizzaDude.
Megalithic has some promise. Unfortunately the author, Daniel Ortega, did not refine the Dan Zadorozny's Hulkbuster design so that the structure works as well in basic black and white as it does in the version showing shades of grey.
The other suggested fonts also give hints as to what is feasible. For example MAWNS Rock shows what can be done with a simplified graphic treatment of wear and tear, but would be much more useful in a version without all the loose rubble.
You have both been most helpful. Shows its worth digging further.
Don

Here are two pictures of the actual polygonal building stones used by the Incas:

Seems to have been the inspiration, at least in part, for the _Secret of the Incas_ lettering.
Don

They got right the reference to the correlation between Inca architecture and the trapeze.

I just stumbled on this: http://www.myfonts.com/fonts/linotype/truckz/
While its decoration want to resemble tire treads, I think it’s abstract enough to remind stone surface roughness (even if a bit too regular).

Thanks. Interesting treatment of the treads could be adapted.
Don