A Medieval Hospital In Madrid

In 2013, construction workers unearthed a 15th-century hospital in Madrid during an excavation for a new Apple Store. Four years earlier, other construction workers at a neighboring site had uncovered the ruins of an adjoining church. It is believed the hospital was used to treat plague patients before being demolished in the 1850s.
I'm wondering, if s/o writes:
"Faaaake - how can it be?
The US exist since 1776-07-04 ! Nothing can be before!
Don't be a woke leftist, do your own research, touch some grass and never trust science or the universities!"
Bomb! What the fuck?