Canonical version
‘Abdu’l-Bahá laid the cornerstone of the House of Worship in Wilmette,…
‘Abdu’l-Bahá laid the cornerstone of the House of Worship in Wilmette, Illinois, on 1 May 1912. A temporary tent covered a spot of prairie overlooking Lake Michigan. People from different nationalities were on hand to ceremoniously turn over a bit of soil. An ordinary spade was used, but when the Master’s turn came He was handed a golden trowel. He handed it back and used instead the same spade as the others. He then laid the cornerstone.
Source: Honnold, Annamarie, Vignettes from the Life of ‘Abdu’l-Bahá
Collected from bahaistories.com (Subject: corner-stone).