The Pilgrimage of Lady Fatima Masumaeh (A)
The merits of the pilgrimage of Lady Fatima Masuma (A)
There have been many traditions from the Imams (A) about the rewards awarded to those who perform the pilgrimage of this noble lady, some of which are mentioned below:
1. Imam al-Sādiq (A) has said:
وَسَتُدْفَنُ فيها امْرَأةٌ مِنْ اَوْلادي تُسَمّى فاطِمَةَ، فَمَنْزارَها وَجَبَتْ لَهُ الجنّة
“A lady from my children, by the name of Fatima will be buried in Qum . Whoever visits her [shrine], will certainly be admitted to Heaven.” 
2. Imam al-Sādiq (A) has also said:
اِنَّ زِيارَتََََها تََََعْدِلُ الجَنَّة
“Visiting her earns Heaven.” 
3. Sa`d ibn Sa`d al-Ash`arī narrates, “I asked Imam al-Ridā (A) about the reward awarded for performing the pilgrimage of Lady Fatima Masuma (A) and the Imam (A) replied:”
مَنْ زارَها فَلَهُ الجنّة
“Whoever visits her [shrine], his reward will be Heaven.” 
4. Imam al-Ridā (A) has also said:
مَنْ زارَها عارِفاً بِحَقِّها فَلَهُ الجنّة
“Whoever visits her [shrine], while knowing and being aware of her high status, the reward for him will be Heaven.” 
5. Imam al-Ridā (A) has also said:
مَنْ زارالْمَعْصومَةَ بِقُمّ كَمَنْ زارَني
“Whoever visits Masuma in Qum , it is like he has visited me.” 
And Imam al-Ridā (A) has also said:
اَلا فَمَنْ زارَني وَهُوَ عَلى غُسْلٍ، خَرَجَ مِن ْذنوبِهِ كَيومٍوَلَدَتْهُ اُمُّهُ
“Be aware, whoever visits me in a state of purity [after doing ghusl], he will come out of sin and become cleansed [purified of sin], as if he has just been born from his mother.” 
Therefore, it follows that that same purity is obtained from performing the pilgrimage of Lady Fatima Masuma (A).
6. A Shi`a went to perform the pilgrimage of Imam al-Ridā (A) and after the pilgrimage he decided to go to Karbalā . On his way, he saw Imam al-Ridā (A) in a dream. Imam (A) said to him, “Why did you not also pass through Qum and perform the pilgrimage at the grave of my sister?” 
7. Mullā Haydar Khānsārī narrates a tradition from Imam al-Ridā (A):
“Whoever is unable to perform my pilgrimage, he should perform the pilgrimage of my brother in Ray [HadratHamzah, buried near Hadrat `Abd al-`Ađīm] or my sister [Lady Fatima Masuma (A)] in Qum . He will get the same reward as he would for performing my pilgrimage.” 
8. Imam Muhammad Taqī al-Jawād (A) has said:
مَنْ زارَ عَمَّتي بِقُمّ فَلَهُ الجَنَّةُ
“Whoever visits my aunt [Lady Fatima Masuma (A)] in Qum , will enter Heaven.” 
From the foregoing traditions we can see the immense reward, narrated from three Imams (A), of performing the pilgrimage of this noble lady.
An interesting point is that, in tradition no. 5 above, Imam al-Ridā (A) has made the reward of performing the pilgrimage of Lady Fatima Masuma (A) equal to that of performing pilgrimage at his own grave.
It is also interesting to compare this tradition with the following:
Imam al-Sādiq (A) was asked, “what is the reward of someone who performs the pilgrimage of one of the Imams (A)?” Imam (A) replied:
كَمَنْ زارَ رَسولَ الله
“It is like he has visited the Prophet (S) of Allah.” 
Etiquettes of the pilgrimage
The following points should be borne in mind at the time of going to the holy shrine for Ziyārat:
Before going to the shrine, purify yourself by performing the ritual bath (ghusl).
Then with clean, perfumed clothes go to the shrine. Before entering the hall of the burial chamber, one must recite the short request of permission to enter (idhn-e dukhūl).
Then enter with the right foot, with humility and reverence, face the Qiblah and recite:
الله اكبر - Allah is Greater 34 times;
سبحان الله - Glory be to Allah 33 times;
الحمد لله - All praise is for Allah 33 times.
On first seeing the tomb, recite the Salawāt, then recite the Ziyārat facing her shrine, with full concentration and awareness of the meaning of the words you are saying and of the personality you are addressing.
After completing the Ziyārat, recite two units of prayer (salāt), which is recommended after every Ziyārat. This prayer demonstrates the fact that while we revere the personalities that we have addressed in the Ziyārat, it is only Allah Whom we worship. All prostrations are for Allah only, and prostration for anyone else is forbidden.
أتقرّب إلى الله بحبّكم
“[O Ahl al-Bayt!] I seek nearness to Allah through my love for you."
Notes amd References:
Bihār al-Anwār , vol. 48, p. 317; vol. 60, p. 216 & vol. 102, p. 266. 
Ibid., vol. 60, p. 219. 
`Uyūn Akhbār al-Ridā , vol. 2, p. 267. 
Bihār al-Anwār , vol. 48, p. 317. 
Nāsikh al-Tawārīkh , vol. 3, p. 68; Rayāhīn al-Sharī`a , vol. 5, p. 35. 
`Uyūn Akhbār al-Ridāa , vol. 2, p. 260. 
Anwār al-Masha`sha`īn , vol. 1, p. 212. 
MullāHaydar Khwānsārī, Zubdat al-Tasānīf , vol. 6, p. 159. 
Bihār al-Anwār, vol. 102, p. 265.
 `Uyūn Akhbār al-Ridā, vol. 2, p. 262.
Other useful links:
Short Life History of Hadrat Fatima Masoomah (A.S)
The Birth of the Holy Lady Fatemah Ma'soomah and her childhood
The Merits for Visiting the Holy Shrine of Hadrat Masoomah (A.S.)
A Glance of Holy Shrine
The Noble Descent of Hadrat Fatima Masumah (A.S.)
Hadrat Ma’soomah's (A.S.) Superiority in Knowledge and Virtue.
Hadrat Masumah (A.S.), the Great Narrator of Ahadith
The migration of the Imam's sister Ma'soomah (S.A.) from Madina to Merv
Fatimah Al-Ma'sooma Represented the purity and infallibility Prophet's Daughter.
The beginning of her grief and the martyrdom of her father