Ernest Joseph Dennen of Lynn, Massachusetts, it is to date the oldest continuously running summer camp in the United States.
[1] It began its life as the summer camp of the Order of Sir Galahad, an Episcopal church organization founded by Dennen in 1896.
[2] Originally founded as an explicitly Episcopal camp, O-AT-KA allowed Jewish campers as well.
[5] During the off-season, O-AT-KA is also a popular venue for weddings and other events.
It has been featured on Martha Stewart's website, described as making one, "feel like you stepped into a Wes Anderson film.