Besides being hundreds of years old, you still don’t want to touch the walls.
It can hurt. This building was made with tabby.
Tabby is a type of concrete made by burning oyster shells to create lime, then mixing it with water, sand, ash and broken oyster shells.
Tabby was used by early Spanish settlers in present-day North Carolina and Florida, and by English colonists primarily in coastal South Carolina and Georgia.
The construction here was in 1742. What current buildings last half as long ?