World-renowned for being one of the first true "skyscrapers," because of the use of a full steel frame, this building was the design of famous American architect Louis Sullivan, and opened in 1895. The terra-cotta facade is very ornate, featuring geometric designs as well as foliage. Inside, the original lobby skylights and tile mosaics remain intact. Saved from the wrecking ball in the 1980s by local citizens, this beautiful edifice is also known locally by the name it bore for much of its earlier life: the Prudential Building.