The hunt for Greater Short-Horned Lizards in the bearpaw shale of Grasslands National Park gets off to an inauspicious start on a cool September day as the sun fights to break through the clouds.

With 423 units of the National Park System from which to choose, there will never be a shortage of questions and interesting trivia to test your knowledge and provide you with a fact or two you can use to impress family, friends, and colleagues.

Two moderate earthquakes, one of which registered as a magnitude 5 temblor, rattled the island of Hawaii on Friday morning and could be related to recent geologic activity at Mauna Loa in Hawai'i Volcanoes National Park, the U.S. Geological Survey reported.

Staffing shortages are behind the decision to close Wetherill Mesa at Mesa Verde National Park a week earlier than expected.