Wikipedia's "special" pages
There are a few so-called "special pages". Most of them show the properties of and the relationships between articles. Special:Newpages gives you a list of all recently created articles, which is useful to spot newbie experiments. Special:Ancientpages is the exact opposite — it lists the oldest pages in the wiki. Many of them need work. Some of the special pages are only generated intermittently for performance reasons. Two useful ones are Wikipedia:Most wanted stubs and Wikipedia:Most wanted articles.
Read more: Help:Special page