this review is for the "hard hat tour" which are currently the only way to tour the site (http://www.riversofsteel.com/things-to-do/tours/).
i knew a little bit about the industry and purpose of a "steel furnace" prior to the tour, but the guides did a great job explaining the process and how all of the massive structures were used.
our group was lucky enough to hear from someone who worked in the furnace for many years, providing a firsthand account of the hard-work, danger, and teamwork that went into everything.
definitely recommended to anyone even remotely interested in america's industrial history.
that said - even if you're not interested at all, the approximately hour long tour is worth it just for the chance to walk through the site, and the actual buildings.