The best stuff, to me, are the marquees, FOH signage, and lobby boards. These are legacy items of Broadway's history.
This year, I'm looking for the REBECCA marquee. Even if they actually make it to Broadway this year, they don't have the Broadhurst, so that marquee is now kaput. It actually went up not once, but TWICE, despite the production never even making it to load-in.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle