Some popular areas in the park will reopen before May 15 if weather allows, and a House bill could fast-track some work.

Tribes and environmentalists say the Interior Department's actions are attempts to erase complete tribal histories from park ...

The King's Trough Complex is a several-hundred-kilometer-long, canyon-like system of trenches on the North Atlantic seafloor.

If you're near Phoenix and drawn to ancient history or lesser-known national monuments, Casa Grande is worth a detour.