The Roman Colosseum.
“Knowledge is one of the wondrous gifts of God. It is incumbent upon everyone to acquire it. Such arts and material means as are now manifest have been achieved by virtue of His knowledge and wisdom which have been revealed in Epistles and Tablets through His Most Exalted Pen—a Pen out of whose treasury pearls of wisdom and utterance and the arts and crafts of the world are brought to light.”
Baha’u’llah, Tablets of Baha’u’llah, p. 39