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688 AD — construction of the Dome of the Rock
In 688–691, Caliph Abd al-Malik built the Dome of the Rock on the Temple Mount in Jerusalem. One of the world's most beautiful buildings has stood there for 1335 years.
History
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6880 = 2⁵ × 5 × 43: technetium at the core
6880 = 32×215 = 2⁵×5×43. The 43rd element is technetium — the first artificial element. The number is built on a man-made foundation.
Science
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22 → 4 with zero: the builder falls silent
6+8+8+0=22→4. Master Builder ending in zero — a pause after great labour. The number builds something monumental — and retreats into silence.
Numerology