We cried. We cry. And you will cry too.

That was one of the messages from hungry people who suffered through famine as far back as 1417 in what is now the Czech Republic. They carved their notes on the stones to warn future generations of the dangers of drought: Spoiled crops, expensive food and widespread hunger.
During a 2013 study on the rocks, researchers revealed that numerous dates had been carved on its surface.
The markings are dated 1417, 1616, 1707, 1746, 1790, 1800, 1811, 1830, 1842, 1868, 1892 and 1893 – believed to note the years of the worst droughts in the area.