The ghost orchid, perhaps the rarest of the 30 species of orchids in Big Cypress National Preserve, needs to be protected under the Endangered Species Act or risk being lost to extinction, according to a petition conservation groups submitted to the U.S. Fish and Wildlife Service.

After a long hiatus, underground tours are returning to Jewel Cave National Monument in South Dakota.

Charles "Buffalo" Jones is just a footnote in Yellowstone National Park's history, but his work more than a century ago might have played a role in a current legal drama revolving around whether Yellowstone bison are an endangered species.

How much do you really know, or think you know, about the various units within the National Park System? Test your national parks knowledge and maybe learn something new with this Quiz and Trivia #45.