For 10 points, name these seven extant structures that serve as places for prayer for a tolerant monotheistic religion.
A glass-less building of this type is located on the "Singing Hill," or the "Cerro Sonsonate." A home for the aged was added as a dependency of one of these buildings whose construction began during the Ten Years' Crusade. The first of these buildings was demolished and converted to a public park following a 1948 earthquake in Ashgabat. Nine intricately-carved quartz and Portland cement pillars are the key feature of a building of this kind designed by Louis Bourgeois. The official name for these buildings is "Dawning-place of the praise of God," or (*) Mashriqu'l-Adhkar. The "Greatest Name" is engraved above each of the nine doors of the only building of this kind in North America, located in Wilmette, Illinois. The "most visited building in the world" is one of these clergy-less, tranquil structures consisting of twenty-seven marble "petals" arranged in groups of three, resembling a lotus flower, that is located in New Delhi. For 10 points, name these seven extant structures that serve as places for prayer for a tolerant monotheistic religion.
A glass-less building of this type is located on the "Singing Hill," or the "Cerro Sonsonate."
Bahai House of Worship [or Bahai Temple; accept Mashriqu'l-Adhkar before it is read]