The Haʻikū Stairs, also known as the Stairway to Heaven or Haʻikū Ladder, is a steep hiking trail on the island of Oʻahu. The trail began as a wooden ladder spiked to the cliff on the south side of the Haʻikū Valley. It was installed in 1942 to enable antenna cables to be strung from one side of the cliffs above Haʻikū Valley to the other. A building to provide a continuous communication link between Wahiawā and Haʻikū Valley Naval Radio Station was constructed at the peak of Puʻukeahiakahoe, elevation about 2,800 feet (850 m). The antennae transmitted very low frequency radio signals from a 200,000-watt Alexanderson alternator in the center of Haʻikū valley. The signals could reach US Navy submarines as far away as Tokyo Bay while the submarines were submerged.

“Exactly one year before the long awaited Sochi Olympics, Vladimir Putin went to Sochi personally to see how the construction is going. After receiving a report saying the ski jumps that were supposed to be ready in 2011, are not completed still, while their price has sky-rocketed from 1.2 billion to 8 billion roubles, he commented, “Good for you. Good job”, and then fired the vice president of the Olympic committee. Russian artist Vasily Slonov painted his view of the upcoming games, giving a new interpretation to the adored Russian mascot Cheburashka, and combining officially endorsed stereotypes of Russia with grimmer and less accepted ones”. – Ruskie.info. (Photo by Vasily Slonov)

Rescuers search for survivors in the rubble of a collapsed residential building in Makongeni estate in Nairobi December 17, 2014. Three more bodies were recovered on Wednesday night from the building that collapsed in Makongeni estate in Nairobi, raising the death toll to four, Kenya Red Cross has reported. The residential building whose sixth floor was still under construction had allegedly not been cleared for occupation by the Nairobi City County and its owner has been missing since it collapsed. A search and rescue and rescue operation is ongoing for the unknown number of people still trapped under the rubble, Kenya Red Cross also reported. (Photo by Thomas Mukoya/Reuters)

A man stands between thousands of paper lanterns, which were displayed and lit up the precincts of the shrine, where more than 2.4 million war-dead are enshrined, during the Mitama Festival at Yasukuni Shrine in Tokyo, Japan July 13, 2016. “Mitama” is a respectful word that means “the soul of a dead person” in Japanese, and this “Soul Festival” honors just that. (Photo by Issei Kato/Reuters)

Inside the new Digital Art Museum in Tokyo, Japan on June 21, 2018. These incredible photos show what it looks like inside a groundbreaking new digital art museum in Japan. A trip to the Mori Building Digital Art Museum: teamLab Borderless in Tokyo, which opened last week, can make you feel like they you are dreaming and aims to fully immerse visitors in the art. Spanning a spacious 10,000 square metres, 520 computers and 470 high-tech projectors create the illusion that the visitor is wandering through rice fields, following shoals of fish or even bouncing on a galaxy of planets. (Photo by South West News Service)

A pro-Russian armed man secures crash site wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. (Photo by Antonio Bronic/Reuters)

Roof-topping enthusiast Daniel Lau takes a selfie with high-rise buildings down below as he stands on the top of a skyscraper in Hong Kong, China on August 15, 2017. A craze that began in Russia has now taken hold in Hong Kong, one of the world's most vertical cities. Mr Lau said he had been inspired by Russian climbers and that he was unafraid of the vertiginous heights he scales. (Photo by ImagineChina/Rex Features/Shutterstock)

A radiation monitor indicates 114.00 microsieverts per hour near the building housing the plant's No. 4 reactor, center, and an under construction foundation, right, which will store the reactor's melted fuel rods at Tokyo Electric Power Co.'s tsunami-crippled Fukushima Dai-ichi nuclear power plant in Okuma, Fukushima prefecture, Wednesday, March 6, 2013, ahead of the second anniversary of the March 11, 2011 tsunami and earthquake. Some 110,000 people living around the nuclear plant were evacuated after the massive March 11, 2011, earthquake and tsunami knocked out the plant's power and cooling systems, causing meltdowns in three reactors and spewing radiation into the surrounding air, soil and water. (Photo by Issei Kato/AP Photo/Pool)