Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
The Tour page links to https://augur.stackexchange.com/ .
Augur Stack Exchange closed and this link now redirects to an Area51 paged informing visitors that Augur closed 3 months ago.
That is arguably not very useful.
Thank you, I've removed the link to the Augur page.