The Duke Lemur Center is "the world's largest sanctuary for prosimian primates in the world." [from Wikipedia]
It's located in Duke Forest.
The Center offers tours: "All tours are by appointment only and are conducted seven days a week. Tours are paid for the day of by cash, check or any major credit card. We look forward to hosting your visit. Tours tend to book up 2-3 weeks in advance, longer for weekends during the spring and summer months." [source]
Call (919) 489-3364 ext.0 or (919) 401-7240 to make a reservation.
And here's how to get there: http://lemur.duke.edu/visit/directions/
Working there as a student
If you're a Duke student you can take classes at the Center (most classes are offered through the Department of Evolutionary Anthropology), volunteer, intern, or do a work study. There's lots of information here: http://lemur.duke.edu/engage/student-opportunities/