South Wellfleet Marconi Station

The Marconi Wireless Station Site in South Wellfleet, Massachusetts, USA is the site of the first transatlantic wireless communication between the United States of America and Europe, on January 18, 1903. At this location, now part of the Cape Cod National Seashore (though no admission is charged if not visiting Marconi Beach), inventor Guglielmo Marconi erected a large antenna array on four 210-foot (64 m) wooden towers, and established a transmitting station powered by kerosene engines that produced the 25,000 volts of electricity needed to send signals to a similar station in Poldhu, Cornwall, United Kingdom.

Source: Wikipedia — South Wellfleet Marconi Station (CC BY-SA 4.0)