Learning where it was eventually led to this writeup in Wired about the piece in question, as well as the larger installation it's a part of.
(Puerto Vallarta) is actually very nice, by and large, though for whatever reason it did not agree with my constitution. One day I strolled the lengthy beach-front boardwalk (the “Malecón”) in an effort to adjust and take in local color. I was pleased with the non-touristy things, mostly disgusted with the tourist-targeted nonsense, and greatly impressed and surprised with the copious amounts of statuary dotted along its length.
And then I reached a particular installation, and was simply flabbergasted…
Known as “La Rotunda del Mar” (”The Circle of the Sea” in my poor, poor Spanish), this installation by artist Alejandro Colunga features creatures/beings straight out of Innsmouth and Lovecraft’s imaginings. Fabulous!
By any standards it's an amazing bit of work, but the depiction of towering tentacled forms arranged like an altar makes it one of particular interest to Mythos aficionados. I can't help thinking of Fritz Leiber's "The Terror From the Depths", probably the best story involving modern artistic and architectural interpretations of the Mythos ever written, while looking at it.