From the Baha’i Writings:
“You have asked about visiting holy places and the observance of marked reverence toward these resplendent spots. Holy places are undoubtedly centers of the outpouring of Divine grace, because on entering the illumined sites associated with martyrs and holy souls, and by observing reverence, both physical and spiritual, one’s heart is moved with great tenderness.”
(‘Abdu’l-Bahá: Synopsis and Codification of the Kitáb-i-Aqdas, p. 61)