This site is on the national historic register of the Atomic Energy Commission: a real 1950's bomb shelter.

OK. I'm pulling your leg. Actually, according to the nice folk at the Eagle Creek Park office, you are standing in the basement of a former homestead, and if you look around you will see the remains of the foundation, broken clay pipe and a storage barrel or two. The 'shelter' was likely a basement cold storage room, before there was such a thing as refrigeration, or perhaps it was for drainage. If you use your imagination, it could be anything. Like maybe a bomb shelter.
This much is certain: the house has been gone for a long time, as those cottonwood trees growing on top of it are at least 50 years old.
Cache is a 1/2 gallon Gott thermos jug. PLEASE! Recover as well as you found it.
Update: 9/13/05: Starting Sept 2nd, cachers noted that there was alot of crime scene tape near this cache. To learn more about that, read the logs dated from 9/2/05 though 9/13/05. I felt it was important to let seekers know that the police feel this area is safe, and that the cache placement is fine.
Update, July, 2018:
The above text is only slightly altered from 2qwerqE's original listing.
This cache is located in Eagle Creek Park. Park hours of 7am-9:30pm are in affect. Night caching is not permitted; logs indicating such will be deleted.
The cache has been adopted and updated. The cache size and difficulty have been changed to reflect current conditions.
The container is now a large (actually an extra-large) ammo can, because there aren't enough Larges in the Indianapolis area.
The area is significantly more overgrown than when the picture above was taken, and the Honeysuckle is extremely thick. This cache is not recommended for kids or geopups. The terrain rating has been increased to reflect this.
July 8, 2018: Container in place with logbook, a container inside specifically for TBs, and another prestocked with some swag.
Come and get it!