There is a small entrance fee to enter the U.S. Steel Building to go to the top floor referred to as "Top of the Triangle". This review is for potential visitors to the Steel Building who may be deterred because of the uncertainty of gaining access to the top floor. I have made a series of visits in between 1999 and 2018. This site is made up of historical markers and restaurants year-round, a nativity-scene in the winter, and a stunning top floor view of the birth of the "golden triangle" on the top floor visitor center "top of the triangle". This site's mission is to capture the steel history in Pittsburgh and succeeds at that with a variety of national, historic markers and information postings located outdoors. The reason I gave this site a five star rating is because it is the most visible landmark that accurately captures the manufacturing and steel history in Pittsburgh, Pennsylvania. read more