The Great Pyramid of Giza Is Completed for Pharaoh Khufu

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• Architecture09/11/2026@ThePinGang

  Grand Egyptian Museum Fully Open

  Giza, Egypt

  

  Starts 11/01/2025CONFIRMED90% CONFIDENCE326 days agoHappened as dated, per en.wikipedia.org^[1]: "…b of Tutankhamun.[35] The GEM was fully inaugurated on 1 November 2025. The opening ceremony was att…"

  Two decades and a billion dollars in the making, the largest archaeological museum in the world, holding the complete Tutankhamun collection.

  $1.2B

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• Architecture09/15/2026@BuildDesk

  Angkor Wat, the Largest Religious Monument on Earth, is Completed for Suryavarman II

  Angkor Wat, Krong Siem Reap, Cambodia

  

  Starts 01/01/1150ESTIMATED73% CONFIDENCE876.7 years agoWikipedia's^[3] Angkor Wat article states construction "commenced in 1122 CE and was completed in 1150 CE," a period-based estimate rather than a single confirmed day, consistent with other sources citing the reign of Suryavarman II (1113-1150).

  Cambodia's Khmer king Suryavarman II built Angkor Wat as his state temple and eventual mausoleum, a 400-acre complex whose construction ran from around 1122 to 1150 CE.

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• Architecture09/15/2026@BuildDesk

  Egypt's Iconic Tower Completed

  New Administrative Capital, Egypt

  

  Starts 12/31/2024CONFIRMED87% CONFIDENCE1.7 years agoHappened as dated, per the source^[1]: the Iconic Tower's "official completion date was 2024".

  The 394-metre Iconic Tower in Egypt's New Administrative Capital was completed in 2024, becoming Africa's first supertall skyscraper and its tallest building.

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• Architecture09/14/2026@BuildDesk

  Makkah Royal Clock Tower Completes

  Makkah Royal Clock Tower, Mecca, Saudi Arabia

  

  Starts 12/31/2012CONFIRMED80% CONFIDENCE13.7 years agoHappened as dated, per the source^[1]: the tower, "constructed at an estimated cost of USD $16BN," was completed in 2012.

  The $16BN Makkah Royal Clock Tower, holding the world's largest clock face and the highest occupied space on Earth at the time, was completed overlooking Islam's holiest site.

  $16B

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• Science09/15/2026@BuildDesk

  Hyper-Kamiokande Neutrino Observatory Cavern Completed

  Kamioka, Hida, Gifu Prefecture, Japan

  

  Starts 07/31/2025CONFIRMED89% CONFIDENCE1.1 years agoHappened as dated, per the source^[1]: "the University of Tokyo completed excavation of the colossal cavern that will house the main detector volume of Hyper-Kamiokande" on July 31, 2025.

  Crews finished excavating the huge cavern in a Japanese mountain that will house the Hyper-Kamiokande neutrino observatory, a step toward the detector's planned start of observations.

  $600M

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• Architecture09/15/2026@BuildDesk

  Ptolemy II Completes the Lighthouse of Alexandria

  Qaitbay Citadel, Alexandria, Egypt

  

  Starts 01/01/280 BCESTIMATED67% CONFIDENCE2305.7 years agoAncient sources place completion under Ptolemy II around 280 BCE, per the World History^[3] Encyclopedia and Britannica; the exact year is not precisely recorded.

  The Pharos of Alexandria, one of the Seven Wonders of the Ancient World, was completed under Ptolemy II to guide ships into the city's Great Harbor. Commissioned by Ptolemy I and built by the architect Sostratus of Cnidus, the tower stood for over 1,600 years.

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• Architecture09/14/2026@BuildDesk

  Ryugyong Hotel's Exterior Finally Completed After 24 Years

  Ryugyong Hotel, Pyongyang, North KoreaOrascom Construction

  

  Starts 07/31/2011CONFIRMED80% CONFIDENCE15.1 years agoHappened as dated, per en.wikipedia.org^[3]: "In July 2011, it was reported that the exterior work was complete."

  Egyptian contractor Orascom finished cladding Pyongyang's pyramid-shaped Ryugyong Hotel in glass in July 2011, ending a stop-start construction saga that began in 1987 — though the 330-metre tower has never opened to a single guest.

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• Infrastructure09/14/2026@ThePinGang

  Egypt Opens the Mubarak Pumping Station on the Toshka Project

  Toshka, Aswan Governorate, EgyptMinistry of Water Resources and Irrigation

  

  Starts 03/01/2005CONFIRMED78% CONFIDENCE21.6 years agoSources agree the Mubarak Pumping Station "was inaugurated in March 2005"; no source gives the exact day, so this pin is dated to the start of that month.^[1]

  The world's largest pumping station begins lifting water from Lake Nasser into the Sheikh Zayed Canal, launching Egypt's attempt to grow a second Nile valley 310 km into the Sahara.

  $436M

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• Architecture09/14/2026@BuildDesk

  Hagia Sophia's Dome Restoration

  Hagia Sophia, Istanbul, Turkey

  

  Starts 04/14/2025CONFIRMED88% CONFIDENCE1.4 years agoHappened as dated, per the source^[1]: dome restoration was "scheduled to commence on April 14, 2025"; no completion date has been set for the wider 50-year reinforcement plan.

  Istanbul's 1,500-year-old Hagia Sophia began restoring its dome to withstand a major earthquake, a phase of a 50-year plan to reinforce the building with no fixed finish date.

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• Architecture09/14/2026@BuildDesk

  Nakagin Capsule Tower Demolition Begins in Tokyo

  Nakagin Capsule Tower, 8-Chome Ginza, Chuo City, Tokyo, 104-0061, Japan

  

  Starts 04/12/2022CONFIRMED83% CONFIDENCE4.4 years agoHappened as dated, per the source^[1]: "Demolition of the Nakagin Capsule Tower Building began on 12 April 2022."

  Crews began tearing down Kisho Kurokawa’s Metabolist icon in Tokyo’s Ginza district, ending its 50-year run as a symbol of modular architecture.

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• Mining09/21/2026@BuildDesk

  Oyu Tolgoi Reaches Full Underground Output

  Rio Tinto·…Oyu Tolgoi mine, Khanbogd, Ömnögovi, Mongolia

  Starts 12/31/2028ESTIMATED65% CONFIDENCEin 2.3 yearsRio Tinto^[1] expects Oyu Tolgoi to produce around 500,000 tonnes of copper a year on average from 2028 to 2036 across the open pit and underground. Only the year is given, so the pin takes its last day.

  Rio Tinto's Oyu Tolgoi in the Gobi is expected to average around 500,000 tonnes of copper a year from 2028, on its way to being the world's fourth-largest copper mine.

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• Property09/20/2026@BuildDesk

  New Murabba's Riyadh District Completes With the Mukaab on Hold

  Al-Qirawan, Riyadh, Saudi ArabiaNew Murabba Development Company

  

  Starts 12/31/2040DELAYED11 years late40% CONFIDENCEin 14.3 yearsThe January 2026 report says the district "is now slated to be completed by 2040", a year rather than a fixed day, so the pin sits at the end of that year.^[1]

  The 14.1 sq km district launched in 2023 was built around the Mukaab, a 400 m by 400 m cube holding roughly 2 million sq m of floor space and a domed AI-powered display. In January 2026 all work on the cube beyond soil excavation and piling was suspended while its financing and feasibility were reassessed, though development of the surrounding real estate continues; Knight Frank has estimated the district's cost at about $50 billion.

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