"World War II motivated the U.S. military to build a radio transceiver station atop Hawaii’s Puʻukeahiakahoe mountain. The station sent low-frequency signals to communicate with submarines navigating around Japan. The Haiku Stairs (Haʻikū means “sharp break” in Hawaiian) offers a steep 2,500-foot ascent on Oahu that reaches the now abandoned station. Despite receiving an $875,000 metal renovation in 2003, according to to-hawaii.com, the trail is forbidden to many visitors wanting to endure the series of steps. The prohibition, nevertheless, hasn’t held back everyone from the climb and arriving at its wonderful island landscape views."