Why beautification of Baha'i Shrines in Israel?

Since in the Holy Land the Bahá’ís had to teach indirectly, the Guardian said one such way was to beautify the Shrines.

He told us that acquiring the heart of the mountain, which the Bahá’ís owned by 1935, was not easy, because there were many enemies of the Faith in that place, and the Covenant-breaker Muhammad-‘Alí was still active through his son, who was employed in the Land Registry Office, while various other elements were also actively against the Faith.

http://bahairesearch.com/english/Baha%27i/Baha%27i_Studies/Marzieh_Gail/Arches_of_the_Years.aspx