The Subway hike in Zion National Park is one of our favorite hikes (we may say that a lot, but we really really like this one too). It is not for those unprepared (you need a permit too) as it is a quite grueling hike. The beauty offered is very close next to none.
From the descent, to the slot canyon, to the cascading waterfalls, to the pot holes, it’s just a beautiful hike and canyon.