The enormous "Portal el Inframundo" (Eng. Portal to the Underworld), an ancient Olmec monument, has returned to Mexico after many ordeals. For nearly 3,000 years, it adorned the walls of the ...

Explores the world's most fascinating, strange and inexplicable mysteries, with special complications. A look at the possibility of structures like the Men-an-Tol monolith or the colossal Olmec ...