Stairway to Heaven
The Haiku Stairs, also known as the Stairway to Heaven, is an insanely narrow and steep series of steps that cover 2,500 vertical feet up the mountain near Kaneohe, HI. They were constructed by the military during World War II and access a radio transceiver station at the top.
Now, access to the trail is restricted. It's one of those odd situations that only happens in Hawaii. It's not illegal to hike the steps, but a private guard is posted at the trailhead to turn back hikers. The guard will stop people from starting the trail, but he is perfectly friendly to people exiting it after they finish. Normally people hike up in the dark and catch sunrise at the top, but people report being turned back as early as 1 AM. We arrived at the stairs around 3:30 AM, the guard hadn't arrived yet, and we started climbing.
The entire hike up was dark, wet, windy, and in the clouds, and we arrived at the radio transceiver station two hours before sunrise. Here I'm hiking down the stairs, with the city of Kaneohe in the background. The clouds cleared over the city, but were forming on the ridge of the stairs. It was odd hiking down with clear skies on one side and pure fog/cloud on the other.