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I have vague memories of this story - probably a short or novelette length published in a magazine like Analog in the 50s or 60s. A human space traveler lands on an artificial planet-sized sphere, finds his way inside, finds civilized beings, takes an elevator down a number of levels, gets out and takes a larger elevator further down, where he again finds an even larger elevator and heads down again.
The story, IIRC, had an odd single-word name like Kerplunk or Skiddoo.
Ker-Plop, a novella by Ted Reynolds, first published in Isaac Asimov's Science Fiction Magazine, January 1979, available at the Internet Archive.
Gradually Cotter Oren’s mind fell out of nothingness into a semblance of existence. To exist was to fall, to drop deeper and deeper towards the center. To transfer to larger and larger elevators, descending deeper and deeper into a world, a universe, Galgaronok.
