It's not a font I can find. Often times, people will use Trajan Pro:
http://www.myfonts.com/fonts/adobe/trajan/

Schneidler Initials (which I have used several times):
http://www.myfonts.com/fonts/groupty...dler-initials/

Caslon Openface:
http://www.myfonts.com/fonts/bitstre...lon-open-face/

Etc.