Miracle at the Pool

...and [Jesus] anointed the eyes of the blind man with clay, and said unto him, go wash in the pool of Siloam. He went his way therefore, and washed, and came seeing.
-John 9:6-7

The actual Pool of Siloam was uncovered in old Jerusalem. For the believers, this is yet another validation of our faith. However, there are still those who must see to believe.

7 And he that seeketh signs shall see signs, but not unto salvation.
8 Verily, I say unto you, there are those among you who seek signs, and there have been such even from the beginning;
9 But, behold, faith cometh not by signs, but signs follow those that believe.
10 Yea, signs come by faith, not by the will of men, nor as they please, but by the will of God

-Doctrine and Covenants 63:7-10