A Shofar a Thousand Cubits Long

HISTORICAL INTERIOR OF THE RASHI SHUL IN WORMS
R. Tavi said in the name of R. Yoshia: "What do we learn from the following text? 'There are three things that are never satisfied:... the grave and the womb....' How comes the grave next to the womb? - This juxtaposition teaches you that just as the womb takes in and gives forth again, so the grave takes in and will give forth again. Moreover, if the womb which takes in silently gives forth with loud noise [i.e., the crying of the infant], does it not stand to reason that the grave which takes in with a loud noise [i.e., the wailing of the mourners], will give forth [those who are revived] with a loud noise? Here is an answer for those who deny that Techiyas HaMeisim is taught in the Torah."
Rashi cites the verse (Yeshayahu 27:13), "And it shall be on that day, that a great Shofar shall be sounded...." The Midrash entitled Osios deRabbi Akiva elaborates (sec. 9): "How will the A-mighty resurrect the dead in the time to come? He will take up a Shofar a thousand cubits long and will sound it, and it will reverberate from one end of the world to another. With the first blast the world will be in an uproar; with the second, the earth will split," and so on. See also Pirkei deRabbi Eliezer, sec. 34.

 http://www.sichosinenglish.org/books/to-live-and-live-again/02.htm#n43

"Every single word of prayer, blessing, thanksgiving and praise that you will say this coming year, are contained within the shofar’s ten sounds" -> Dvar Torah for Rosh HaShanah 5771 -> http://www.breslov.org/blog/