References 483% CONFIDENCEOverall confidence: 83%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]90%youtube.com/watch?v=KxjlLKKFkEYyoutube.com· Posted Sep 15, 2026· Starts Oct 9, 1888 ✓· 24% of score
Happened as dated, per the source: "opened to the public in Washington, D.C., on this day in history, Oct. 9, 1888".
- [2]80%en.wikipedia.org: cost of The Washington Monument Opens to the Publicen.wikipedia.org· Added Oct 24, 2026· 28% of score
Total cost 1848-1888 (infobox lists $1,187,710 for the structure)[1]
- [3]88%Washington Monument | History, Height, Dimensions, Date, & Factsbritannica.com· Added Sep 15, 2026· 24% of score
Britannica's own entry on the Washington Monument is a respected general reference, though the page itself could not be fetched to quote directly.
- [4]75%On this day in history, October 9, 1888, the Washington Monument opens to the publicfoxnews.com· Added Sep 15, 2026· 24% of score
Fox News states the monument "opened to the public in Washington, D.C., on this day in history, Oct. 9, 1888," matching the pin's stored date exactly.
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