Johnsville Naval Air Development Center. This site was acquired by the U.S. Navy during World War II from the Brewster Aircraft Corporation; it served as a strategic locale for weapons development and testing of modern aircraft. Later, it was a training facility for America's Mercury, Gemini, and Apollo space programs.

E Street Rd., 200 yds. N of Newton Rd., Warminster, PA, United States

John Fitch's Steamboat. Fitch tested near here a model steamboat in 1785. Before his death in 1798, he built 4 mechanically successful steamboats. The first in the U.S., they proved financial failures, leaving final success of the idea to Robert Fulton.

At Craven Hall on Newtown Rd. near Street Rd., Warminster, PA, United States

Log College. Built by Rev. William Tennent c. 1735, it was the first academy in America for the training of Presbyterian ministers and the first college in Pa. A number of notable revivalist preachers and educators graduated from this rustic school before it closed upon Tennent's death in 1746. Soon after, several Log College graduates helped establish Princeton University in New Jersey. Many other colleges trace their roots to this early institution.

Between 800 and 886 N York Rd. (PA 263), near Tennyson Dr., across from Log College Manor, Warminster, PA, United States