Tube Torcher (GC3CC9) is a 5/5 rated urban cache that is widely regarded as one of the best cache hunts in the US. Located near Hendersonville, NC this highly regarded cache combines much more of a physcial challenge than your typical cache with the ability to rub up against some folks' phobias and a well thought-out adventure. It has an Indiana Jones movie theme which is thoughtfully carried out through out the hunt.
While it may not be the hardest cache, the thought and effort put into this hunt has earned it a place on many a cacher's all-time Top 10 list.
Update: Just found out that TT has been archived, but the owners are promising Tube Torcher II! Stay tuned! --BigWhiteTruck 15:31, 10 January 2006 (EST)