The answer to the Ultimate Question? * 10051619216804.867142857142859548 [The less significant digits of your solution are ... well ... not significant] Geochecker link

The cache is located near the site where this early brethren of Deep Thought was developed: Note: It is not the "Milliard Gargantubrain", the "Googleplex Star Thinker in the Seventh Galaxy of Light and Ingenuity", the "Great Hyperbolic Omni-Cognate Neutron Wrangler" nor the "Multicortoid Perspicutron Titan Muller".

The cache is a magnetic nano - bring your own towel pen. Cache location is quite public, stealth may be required. DON'T PANIC.

For finders: After you log a found entry, I will be happy to email you some links on the historical significance of the site.

[Congrats to doublewe on FTF!!!]

[Hint is for cache location, not for solving the puzzle. If you are in the general vicinity, the hint will be more or less a giveaway]