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Do you like the Temple? Is it beautiful in your eyes? Judging by your response, it sounds as if it is very meaningful to you. I know that when I visit my local Zen center, entering the meditation hall causes such a reaction (along with a deep feeling of peace).
Crying is a natural human response to many situations and stimuli. This article offers a socio-biological reason for the crying response.
Interestingly, at least according to Wikipedia, crying in Buddhism is considered unskillful, as it indicates clinging/attachment.