In 1908, explorer G.E. Kincaid made a shocking discovery in the Grand Canyon: a man-made cavern ... Dive into the mystery the Smithsonian allegedly tried to bury. Judge appears inclined to deny ...

Referring to the polka-dot patterns near the Grand Canyon in a similar context ... on-field investigation are required to unravel the mystery behind the polka-dots visible from space, and likely ...

The man who led a landmark attempt to navigate the entire length of the Grand Canyon did not exactly look ... This is the mystery of risk: What makes some humans willing to jeopardize so much ...