Schifferstadt Architectural Museum

The Schifferstadt Architectural Museum is a 1756 German farm house in Frederick, Maryland, with two-and-a-half-foot-thick stone walls on a bedrock foundation, with a later brick addition. From the museum's literature: "The inclination [of German colonials] was to overbuild to reduce the expectations of the materials and prolong their endurance. It is difficult to find fault with an approach that produced a structure now entering its third century."

A cutaway drawing of the old part of the house, above;
and a photo including the red-brick addition, below.

Note the stone arches in the walls over the windows and door... despite the openings never having been arched. Only the lower floor openings are like this. Evidently, in the absence of large enough stones for solid lintels, this configuration helps distribute the load. It makes sense, and it's probably old hat to smarter people than me.

This shot shows one of the ground-level vents for the root cellar, and the stone sink/lintel just below the window. (It's a little hard to make out; reference the following picture, which I've messed with to increase its visibility.)

The sink, inside. The opening gets covered by a custom-shaped piece of wood when people aren't using it (or taking pictures of it).