Marconi Wireless Telegraphy Station (Kahuku, Hawaii) - Credit: Wikimedia Commons
The Marconi Wireless Telegraphy station is a historic structure on Oʻahu's North Shore between the towns of Kawela Bay and Kahuku. It was briefly the world's most powerful telegraph station.Honolulu Star-bulletin. 24 Sept. 1914. Chronicling America: Historic American Newspapers. Lib. of Congress. Read more on Wikipedia
Source: en.wikipedia.org