I'm guessing that this was once a well used Purple Martin box; looks like the local woodpeckers have done it in.
This sits atop a post among red cedar right off the river pathway about 60' from the Shenandoah River.
Nikon Z 6II
,NIKKOR Z 70-200mm f/2.8 VR S Z TC-2.0x 1/400s f/10.0 at 210mm iso280
UnCropped DX Image ReSized for Internet Viewing
full exif