Caslon is a family of serif typefaces that made it to my list of interesting fonts simply because I think it is beautiful.
What does Caslon look like?
There are many versions of Caslon. This is Caslon 540 BT.
These are variations of Caslon Pro.
What do you use Caslon for?
Caslon is a good font for body text. It is used quite a lot in magazines, journals, books, and as a corporate typeface.
The history of Caslon
William Caslon I was an English gunsmith and designer of typefaces. Around 1720 he created an extended set of serif typefaces. These, as well as all of their consecutive revivals, are referred to as Caslon. Among those revivals are two Adobe versions, called Adobe Caslon (1990) and Adobe Caslon Pro (which includes an extended character set). ITC and a number of other foundries also made typefaces that either are pretty close to the originals or loosely based on them.
Benjamin Franklin was not only a scientist and one of the founding fathers of the United States of America. He was also a printer and he liked the fonts made by William Caslon so much that he hardly ever used any other typeface.
Other sources of information
There is a Wikipedia page which lists the various versions of Caslon out there.