Koko Crater Railway Trail (Koko Head)- Honolulu, Hawai'i

Koko Crater Railway is also known as Koko Head Trail, it is an abandoned World War II railway used to transport supplies up to the top, today it is used as hiking stairs. The railway gets steeper when you get to the middle part, it's a 2000+ steps going up and down. It's a challenging hike but really worth it.