There might be a picture of the airplane which could be
tourism=information etc.
based on Mapillary 2025
https://www.mapillary.com/app/?pKey=2092937764551877&focus=photo

From most other angles it seems like an empty black sign.

osm.org/way/1193004808/history

This milk churn stand memorial might be moved in the future.

Source (use for reference only!)
https://www.pleanala.ie/anbordpleanala/media/abp/cases/reports/321/r321195.pdf

Missing possible POI
Plaque or sign, below cross, on wall of church.

https://api.panoramax.xyz/#pic=58317a53-f91e-41ae-8be8-2a4b5e51f6a4&focus=pic

Missing building
https://api.panoramax.xyz/#pic=97ef062b-6343-4486-8c20-b42395746095&focus=pic

Missing possible POI, knowledge needed.
Black pole with round cap. Unsure of its purpose.

https://api.panoramax.xyz/#pic=774951b9-bc55-4bf4-bd36-16106bcfbb0d&focus=pic

Missing details, survey needed.
Wheelchair access and accessibility details.

Both sides of toilet say it is also for disabled.

Missing possible POIs
Seems like community gardening project with information signs

https://api.panoramax.xyz/#pic=245ec040-5e3b-4d5d-bbf1-f7e1f61ffd9a&focus=pic

osm.org/node/9850823951/history
Are these picnic tables behind the parking in the forest?
I do not see them on Panoramax (2024)
https://api.panoramax.xyz/#pic=74f85220-b6bf-45e0-a10c-518fced5849d&focus=pic

Missing possible POI, survey needed.
standalone gravestone-shaped memorial on grass area in front of tree.
(locality is already tagged as 'The Monuments', might be related.)