There is a warehouse somewhere. It could be in Washington, beneath the National Archives. Maybe it's hidden in the Kremlin, or an obscure wing of the Ashmolean. Perhaps it's in the Vatican.
We don't know the warehouse's location, but we know what it contains: Things THEY don't want YOU to know about. Fragments of the true cross, captive aliens, Tesla's electrical cancer cure, even a prototype mobile phone that acts as a music player, camera, and email reader. (The warehouse has been in operation for a long time.)
This being the information age, you can browse the warehouse's catalog online.
Warehouse 23 is a long-running project of Steve Jackson games, the people who produced Car Wars, the Illuminati card game, and GURPS. You open a box within the warehouse, and get a text description of what it contains. All of the the thousands of entries are user-submitted (but screened to prevent inappropriate knowledge from reaching the public). Some of the things it contains are bafflingly strange. Some are stupefyingly clever. A few are just lame. And now, given that the warehouse has been open to the public for about ten years, one or two are rather dated. Go to the higher floors for more recent additions.
I've wasted an embarrassing number of hours browsing through Warehouse 23, and left a few boxes myself. It beats working.