On: The Beautiful Geometry of 18th-Century Forts

[jws]

From the tail end of these, Fort Jefferson down off the tip of Florida is a fabulous example. The largest masonry structure in the United States. 16 million bricks, a hexagon about 150 meters on a side. It pretty much takes up an entire island.

http://en.wikipedia.org/wiki/Fort_Jefferson,_Florida

Google has great street view walkarounds of it: https://www.google.com/maps/place//@24.6285891,-82.873422,37...

[brudgers → jws]

Fort Jefferson, unlike the earlier fortifications was largely obsolete when completed because rifled artillery could efficiently reduce brick walls to rubble. See Fort Pulaski https://en.m.wikipedia.org/wiki/Fort_Pulaski_National_Monume...