For something visual that's not too abysmal- to visualise correlations at great scale, and to learn about yours in an interesting and useful way...
https://communities.sas.com/t5/SAS-Communities-Library/Large-scale-correlation-analysis-with-the-hyperGroup-CAS-Action/ta-p/612126

Go from tables, charts, and matrices (2-dimensional), to graphs (3-dimensional)- graphs here being the vertices and edges kind.