Less than 10 percent

The amount of the earth’s surface that has been explored, according to “space archeologist” Sarah Parcak, who used satellite photos to discover the lost city of Tanis, familiar as the final resting place of the Ark in Indiana Jones and the Raiders of the Lost Ark. I also read somewhere that the number of archeological sites that have been excavated are likely less than 1% of what previous civilizations have left behind. So think of those stats the next time you worry that the world has no hidden wonders left.