Pennsylvania Fieldstone Buildings

The eastern U.S., particularly southeastern Pennsylvania, has a lot of attractive 18th- and 19th-century farm houses and mills built from stone.  Unlike that shown above, most of the stone used in these houses is irregular fieldstone.  Although there may be others, I have never seen another like that in the photo above.  More typical Pennsylvania fieldstone buildings are shown below.

• A 19th-century fieldstone mill in Berks County, PA.
• A closer view of the fieldstone mill in Berks County, PA.
• A closeup of the quoins in the Berks County, PA mill.
• A very symmetrical fieldstone house. Did they build duplexes in the18th- and 19th-century?
• A closer view of the fieldstone house.
• A very unique stone building (not really fieldstone) in southern Pennsylvania.