Whether it's an inconvenient watermark, crop mark, or some other type of special mark, you may find that at some point, you need to remove special marks from a PDF document. Since PDF documents are ...

The remains of this medieval castle at Castell Llwyn Gwinau, Tregaron, were almost completely plowed over, but they show clearly under parched conditions. Royal Commission on the Ancient and ...

A recent heatwave in the U.K. has revealed outlines of ancient structures previously unknown to archaeologists. NPR's Renee Montagne asks aerial archaeologist Toby Driver what he's been learning. And ...

ABERYSTWYTH, WALES—BBC News reports that an ongoing heat wave in Britain has resulted in the emergence of crop marks across Wales. Crop marks form when dry conditions parch the landscape, but some ...