:) This made me feel a little better

What can I say? Because it was my major professor's speciality, I studied mediaeval apocalypticism thoroughly.

Apocalypse Then: Our Favorite World Expiration Dates

To sum:

1. Year 1000 of the Christian calendar (for obvious reasons)
   
2. 666 after Islam has Pope Innocent III declare a coming apocalypse (1284)
3. Anabaptist prophet Melchior Hoffman claims Jesus will return (1533)
   
4. US Millerites claim Jesus will return October 22, 1844 (the Great Disappointment
   
5. 1910 Halley's (side note from me: really pronounced 'Hawley's', according to the astronomer's family) Comet returns
   
6. Jehovah's Witnesses predict several apocalyptic dates in the 20th century
   
7. A rare planetary alignment, the Jupiter Effect, creates fears of the end of the world
   
8. Heaven's Gate members commit suicide to ascend to comet Hale-Bopp (1997)
   
9. Year 2000 of the Christian calendar (for obvious reasons, plus the possibility of Y2K causing computers everywhere to blow up in our faces)
   
10. 2012: the end of the Mayan calendar on December 21
    

Check out the Wired.com story above for pictures and links for each

And a great site I found through the article is Armageddon Online, which has detailed apocalypses by date and type of apocalypse (destruction by man, destruction by volcano, etc.) from 30-1998 CE, many of them Christian, but not all. Check out the Whoops! Failed Armageddony Prophecies + Predictions for a complete list!

I personally believe that the Earth will end once it is enveloped by the Sun, but as to human civilisation, who knows? It'll probably be our own damn fault, and no celestial alignment or religious salvation will be the culprit.