Reporting this here as not certain the power that be are aware the wiki site https://wiki.guildwars2.com/wiki/ has been down for hours.
Down for maintenance.https://old.reddit.com/r/Guildwars2/comments/fo03ed/psa_wiki_maintenance_on_wednesday_march_25/
The announcement was visible on the main page for a while before going off line. Maybe you missed that.
There was also at least one other thread already saying the same thing when you posted.
I must have missed the notification on the wiki. I checked the forums for other postings and did not see anything, which is the only reason I started this thread.
As for the reddit..... it is rather ridiculous to have to search the black hole of the Internet that is Reddit to find information about ANY other service or site scheduling maintenance. Rather than just making the sub-domain of wiki.guildwars2.com dead, it should have gone to a static HTML or other language maintenance notification page. Would have taken all of two minutes to create and implement, and mere seconds to revert when done.
On Wednesday March 25th 2020, starting at 04:00 UTC-7 and for a period of 12 hours, the wikis will be unavailable while we perform maintenance (more details).
After the upgrade, some templates will require updating to display properly - you can help by reporting bugs.