There is an artificial hill which the Guardian made from the houses of the covenant breakers who had been occupying the Mansion.

The gardens at Bahjí are places where pilgrims and others are to be found slowly walking and trying to absorb and retain that spiritual fragrance. There is an artificial hill which the Guardian made from the houses of the covenant breakers who had been occupying the Mansion. He destroyed those houses and then made them into a terraced hill of gardens. Those who try to resist the Will of God are thus reduced to dust. All that they strove so hard for is now beneath the believers' feet.

(The Baha'i Communities of Iran - 1851-1921 - Volume 1: The North of Iran by Moojan Momen)