These are the best educational visualisations that I know so far. Feel free to comment with more great visuals!

Crypto-to-Crypto Flow

Fiat-to-Crypto Flow

Traceback Mt. Gox

ICO Funding over time

Transaction Path of Lazlo's famous Bitcoin Pizza

Coins sized by market cap / transaction volume

Recksplorer - Bitcoin Lightning​ Network Explorer

Lightning Network Visualizer

Correlation between Bitcoin and Altcoins