Jiayuguan City

In 1974, the Arecibo Observatory was used to send the first known intentional radio message transmission into space

01The 1974 Arecibo Message was aimed at globular cluster M13 — 25,000 light-years away, arrival date roughly 26,974 AD.
02Stephen Hawking publicly warned that contacting aliens could be analogous to Native Americans meeting Columbus — and we know how that ended.
03METI International transmitted 'Sonar' toward GJ 273, a nearby star, in 2017 without any international consensus or oversight body approving it.

Sir Geoffrey Luttrell , mounted, being assisted by his wife and daughter-in-law. Folio 202v.

Jiayuguan fort — the Great Wall's westernmost gate, built in 1372 — was called the 'mouth of China.' Exiles who passed through received no return road; one legend says a single leftover brick still sits unused inside the gate.