Kelly Butte Natural Area - Portland Parks Bureau. Access is south from 103rd & S.E. Division st. Follow 103rd up the windy dead-end and park at the gate. Walk up to the old parking lots for the trailheads.
This big butte hides and houses a huge old (1956) Cold War bunker that was Portland's nuclear fallout shelter for the mayor and other city officials. The "Civil Defense Emergency Operation Center", an "underground City Hall" designed for 250 city officials to be sealed inside for 90 days in the event of an attack. The front wall/entrance has been mostly covered over by bulldozed earth (click on "entrance" photo link below), but you can still see where it was if you go up there, and for a virtual tour of it watch the first few minutes of a strange Cold War era preparedness documentary entitled A Day Called X that was filmed in and outside of this place. To see it click on the "related web page" link above, near the cache ratings, then scroll to the bottom of that page to see external viewing links.
The bunker was later used as Portland's 911 call center, but has been long since abandoned. Today it all has a creepy and spooky and abandoned vibe up there. Fun to poke around and let your imagination run wild, and the nearby trails are forested and pretty like any of the other S.E. Portland buttes.
The initial coordinates are for the Kelly Butte benchmark, cemented into the ground along the main trail. Find the benchmark to answer two puzzle questions to find the hide location:
#1) What year is stamped onto the benchmark? (the year JFK was assassinated, minus two)
#2) What is the $ fine for "disturbing" it?(five squared, times ten)
Add the year number to the decimal minutes of the following dummy coordinate for the hide's true NORTH coordinate:
N 45 27.959
Add the fine number to the decimal minutes of the following dummy coordinate for the hide's true WEST coordinate:
W 122 33.130
The cache container is a one-quart plastic jar, externally marked as a geocache. For first-to-find I put in a wind-up jack-o-lantern toy, a reflector keychain, 2 YAG laser crystals, and the lucky 1965 (Cold War era - how appropriate!) quarter I found on the trail near the benchmark.
It is about 60 feet off of a trail that you'll be on when following the coordinates. Look for a quorum of 7 trees, their trunks sharing the same root system, with one of them serving as the anchor-man for an old broken down barb-wire fence. Find those guys and start searching!
Have fun!
-RoyBatty