The informational slab with which one is accosted when approaching the fort. The original British fort was built over several times. The fort as it exists today was an American effort, built from 1816 to 1851.

Here's the part at the bottom of this slab that you can't read:
The first home of the Boston Marine (now U.S. Public Health System) Hospital (1799-1804)
the fourth oldest hospital in the country which was established through the efforts
of the Boston Marine Society founded in 1742.