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
