Sycamore Knoll, an underwater structure that some say is an alien base, is garnering attention on social media again. It is ...

The stalactites and stalagmites of Sequoia National Park’s Crystal Cave, a sprawling subterranean wonder that’s been closed ...

Located in the tiny town of Belleview in the southeastern part of the Show-Me State, this 129-acre park features massive granite boulders that look like they were dropped from the sky by some giant ...

International Boundary Monument 258 stands as a historic symbol at the border between the U.S. and Mexico, marking the birth of California's shape.