Fort Taylor (built by enslaved africans (but noone wants to talk about it) - Key West

It was built by enslaved people of African descent but there was no mentioned of that on the 75 minute tour I took.

"It is not uncommon for Key West to deny past racism by reciting the claim that Key West was part of the Union during the Civil War. While it is true that Union forces took control of Fort Zachary Taylor and Fort Jefferson, the allegiance of Key West’s citizens at the time is debatable.

The fact that slaves, owned by prominent citizens of Key West who leased them to engineers of the U.S. Government for personal profit, built Fort Zachary Taylor and Fort Jefferson is not debatable." 

https://keysweekly.com/42/slavery-at-fort-taylor-fort-jefferson/ 

Key West’s slavery and emancipation story is quite different from those of other parts of Florida or the U.S. From the first American settlement in 1822, slavery was a part of Florida Keys culture, and by 1860, of 2,913 people at Key West, 451 of them were enslaved.[1] But, as the islands were too small to support large-scale agriculture, the Florida Keys never developed a plantation economy. Instead, the enslaved were often forced to work as domestic servants or as workers in the salt manufacturing business. But surprisingly, the largest single employer of slave labor in the Keys was the U.S. government, which utilized forced labor in the construction of Fort Taylor on Key West and Fort Jefferson at the Dry Tortugas.[2] For many years, Key West slaveowners rented their people to the Army Corps of Engineers to help build the large masonry structures.

https://www.keyslibraries.org/post/island-chronicles-vol-8