Here, the seventh item in the list of galleries, "Italian violin workshops," links to a Javascript jump from the existing page, that will only "execute" from the page (or a page on the site) where it appears.
that may or may not let you straight in. Some sites block access to innard pages unless you come in through the front door and open all the doors in sequence. The "test" of this last link worked in preview, but I may have had their cookie from my previous look.