A stupa, rich in symbolism, filled with relics and consecrated according to sacred texts, is such a powerful holy object that even an unintentional circumambulation purifies negativities and accumulates merit or virtue. Thus animals and insects that inadvertently circumambulate a stupa create powerful causes for auspicious rebirths and eventual enlightenment. - Lama Zopa Rinpoche
The Buddha said that whoever sees a dharmakaya stupa (the essence of knowledge and compassion) will be liberated by the sight of it. The breeze near the stupa liberates by touch, and the tinkling of the small bells hanging on the stupa liberates by sound. Once you have the experience of a stupa, by thinking of this experience, you are liberated through recollection. When a great teacher passes away, his body disintegrates, but to indicate that his mind is dwelling forever in an unchanging way in the dharmakaya, his disciples will erect a stupa as a symbol of the enlightened mind. - HH Dilgo Khyentse Rinpoche
The visual impact of the stupa on an observer brings a direct experience of inherent wakefulness and serenity. Stupas continue to be built because of their ability to liberate sentient beings who simply see their shape. - Chogyam Trungpa Rinpoche
See Also:
The Stupa Information Page
Benefits
and Practices Related to Statues and Stupas, Part 1
Benefits
and Practices Related to Statues and Stupas, Part 2