One from my Visual Slushpile photo blog:
In downtown Louisville, under every street, the original cobblestone streets are hidden beneath a layer of pavement. And beneath those cobblestones is soil that has not been seen by the eyes of man since the mid-1800s.
Anything that someone chose to hide under a cobblestone in the 19th century, or buried in the ground even before the cobblestone streets were laid, has been hidden very well indeed for a long, long time.
Just you think on that.