CSS IE Crasher
When checking and validating the few lines of the Zollverein Gallery source code, I realised that it nicely doubles as a Internet Explorer 6/Win crasher - once you put the code of the menu divs not into a single line, but split it up into one line per link.
Then, IE offers some additional line breaks and spits out the "Interior #5" link twice - click on and hover above them long enough, and this valid code, rendered perfectly well in other browsers, will crash your IE - enjoy. Perhaps I made blatant mistakes. Perhaps it is a well known error. Perhaps it is something new. Do you know why IE crashes on this one?