Dam Nation is an impressive data viz / infographic showing, well, the almost 80,000 dams across the USA based on their hazard potential and the author provides a nice discussion on how he created it on his blog DustyData.
I think the top map with all the 80,000 points and clickable information would be better realized in an environment specifically designed to handle spatial data such as ArcGIS Online, Leaflet, Carto, etc. Scroll-down a little for the awesome pie chart cartogram.
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