Missed this one:

I would argue this doesn't belong in mildlyinteresting only because it's forking awesome. :D

Pretty neat. Didn't realize how many there are. I couldn't get it to display the individual lighthouse data though.

The rest of that site is very cool. Great data visualizations.

Lighthousesnare so damn cool especially because the were literal life-savers for people before GPS.

Which brings me to my question, how are lighthouses used in modern day alongside GPS?