In the Greek municipality of North Kynouria in Peloponnese, near the villa of Herodes Atticus, a wealthy Greek aristocrat and a Roman senator, stands an old aqueduct bridge crossing a small ravine. The aqueduct carries water from a spring located about one and half kilometer to the northwest. The water is rich in dissolved minerals, and over two thousand years of water dripping from the sides of the aqueduct have built up thick deposits that hang like stalactites in a limestone cave.

Photo credit: Dan Diffendale/Flickr