Sci-fi story about tunnel in wall that leads to the same location

I’m looking for the name of a short sci-fi story about a town located near a massive, seemingly endless wall. When the inhabitants find a hole in the wall, they send a man in to investigate what’s on the other side. When the man reaches the other side, he’s flabbergasted at finding out he’s reached the same location, being greeted by the same townsfolk he left behind.

Update: The story was similar to J.G. Ballard’s "The Concentration City" or "What Dead Men Tell" by Theodore Sturgeon, in that the protagonist discovers that, if one kept traveling forward, one finally ended back in the same place (Wormhole/Möbius Strip/Space-time distortion kind of phenomenon). One additional detail I remembered is that at one point, when the protagonist is going through the tunnel in the wall, he sees the light at the point where he entered moving farther away the more he advanced, beginning to see light at the opposite direction up ahead (meaning he simultaneously could see both entrance and exit at one point). But when he reached the end, it was the same entry point where he had waved goodbye to the townsfolk. The story didn’t include intricate plot points of any sort, only a town surrounded by this immense wall, a man entering through a newly-discovered crack/crevice/hole in the wall, going through a tunnel-like passageway, then exiting the same way he came, being asked by the townsfolk (who think he returned) what he saw, much to his shock.

These stories contain similar elements to the one I’m looking for:
"The Concentration City" by J.G. Ballard.
"What Dead Men Tell" by Theodore Sturgeon.
"The Wall of Darkness" by Arthur C. Clarke.
"The Wall Around the World" by Theodore R. Cogswell.
"The Tunnel Under the World" by Frederik Pohl.
"The Tunnel in the Sky" by Robert Heinlein.
"The Long Wall/Settler’s Wall" by W. O. Morley (R. A. W. Lowndes).
"The Pen and the Dark" by Colin Kapp.
"The People on the Precipice" by Ian Watson.
"On" by Adam Roberts.
"Escapement" (Clockwork Earth #2) by Jay Lake.
"Stone and Sky" (The Stone Trilogy #1) by Graham Edwards.
"Kingdoms of the Wall" by Robert Silverberg.
"Stardust" by Neil Gaiman.
"The Tunnel Ahead" by Alice Glasser.
"The Wall at the Edge of the World" by Jim Aikin.

These don’t have similar plot elements, but the titles can be misleading, listed here for clarification:
"The Crack in the Wall" by Walter Jarvis.
"The Great Wall" by Wayne Wightman.
"The Other Side of the Wall" by Stanley Ellin.