Park rangers protect natural resources and historical and cultural monuments. They work in places across the country, from Alcatraz and the Grand Canyon to the Everglades and the Statue of Liberty. Most do everything from supervising park staff to teaching the public to value the site’s resources. After getting experience in the field, a ranger might specialize. With a focus on conserving natural resources, for example, a ranger might replant native grasses on a prairie or test water samples to find the source of pollution. Whatever their duties, rangers need to be able to communicate well with the public. You'll need a bachelor's degree in an environmental field to get this job.