In the Czech Republic, Elbe river water levels have fallen to reveal submerged “hunger stones” dating back hundreds of years. These boulders record past droughts and resulting famines. They also caution citizens — one etched warning reads: “If you see me, weep.”
Dates inscribed on some stones mark years in which they previously resurfaced, including: 1417, 1616, 1707, 1746, 1790, 1800, 1811, 1830, 1842, 1868, 1892 and 1893. And these are not the only shades of past built environments reappearing due to drought. Historic gardens, mansion footprints, even the remains of henges have resurfaced, too.
Earlier this year in Ireland, a large ring-shaped silhouette was spotted on a farmer’s field by observers in an airplane above. Archeologists were consulted and agreed that a henge once stood on this location, originally constructed up to 4,500 years ago.
The site could have gone unnoticed were it not for an unusually dry spell in this famously green country known for its rainfall. The henge itself was built of wood, long ago collapsed and rotted away, but the depressions created by support posts had a lasting impact. Over time, these subtly compacted spots collected water, resulting in slightly different growth patterns. Less-starved crops rising where the ancient monument was erected stand out as greener and healthier, enhancing their visibility against the browner plants on all sides.
“These phenomena are known as cropmarks,” explains Paul Cooper. Where an ancient wall lies buried, water is channeled away, so the grass gets less water. Ancient ditches, by contrast, create areas of deeper soil that hold water more effectively, giving the grass a deeper green.” And water scarcity “heightens these differences.”
In nearby England, other architectural “cropmark” footprints have also surfaced due to drought conditions. The heatwave in Britain revealed, for instance, the remains of an old 17th-century garden (above) on the site of the famous Chatsworth Estate in Derbyshire.
Due to a sweeping regional reorganization by the first Duke of Devonshire hundreds of years ago, an entire town was transformed to accommodate one man’s grand landscape vision. Today, what’s left of that endeavor (and what came before) is starting to show up again.
Surface variations in Nottinghamshire revealed something similar earlier this year: the floorplan of a “ghost” mansion. This elaborate and expansive 18th-century structure was demolished nearly 100 years ago, but the outlines of rooms and hallways became visible again as the foundations below absorbed heat and scorched the soil above.
The hunger stones in Czech Republic in Elbe are visible quite often. One of the reasons is that the river is that the river bed has been reshaped to allow bigger ships. So while they are very impressive, they cannot be used to actually compare the water levels.