Built in 1799 and opened in 1801, the Lazaretto (named for the patron saint of lepers, St. Lazarus), was where immigrants were checked into our country, and if they had disease, where they were quarantined. It closed in 1895 and since then has been a yacht club, pilot-training base, and seaplane landing site, according to the Phila. Inquirer of 3/5/12 at p. A2, and several Web sites. It almost became a parking lot for the nearby Phila. International Airport, but instead is being refurbished to be township offices for Tinicum Township.