Henraux Begins Quarrying Marble at Monte Altissimo

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• Property09/14/2026@BuildDesk

  The Race to Expand Monaco's Borders

  L'Anse du Portier, Larvotto, MonacoMareterra

  

  Starts 12/04/2024CONFIRMED89% CONFIDENCE1.8 years agoHappened as dated, per the source^[1]: "Mareterra^[2] was officially inaugurated by H.S.H. Prince Albert II of Monaco and the princely family on December 4, 2024."

  Monaco inaugurated Mareterra, a $2 billion, six-hectare land reclamation district built into the Mediterranean to ease the tiny principality's chronic space crisis.

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• Architecture09/15/2026@BuildDesk

  Prince Albert I Opens the Oceanographic Museum of Monaco

  Avenue Saint-Martin, 98000 Monaco-Ville, Monaco

  

  Starts 03/29/1910CONFIRMED87% CONFIDENCE116.5 years agoThe museum's own institute (oceano.org^[2]) and multiple tourism/history sources date its inauguration by Prince Albert I to 29 March 1910.

  Monaco's Prince Albert I inaugurated the Oceanographic Museum, an institution he founded to house his marine research, after eleven years of construction into a cliff face above the Mediterranean. The museum, later directed by Jacques Cousteau, remains one of the world's foremost centres for oceanography.

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• Science09/15/2026@BuildDesk

  Marmaray Tunnel Excavators Uncover Constantinople's Theodosian Harbor

  Yenikapı, Fatih, Istanbul, Turkey

  

  Starts 11/01/2005ESTIMATED62% CONFIDENCE20.9 years agoAccounts of the Marmaray excavation (Grand Sirkeci^[3] Hotel's history page and the Harvard 'Urban Imagination' exhibit) place the discovery of the silted-up harbor at Yenikapı in November 2005, without a more precise day recorded.

  Digging for Istanbul's Marmaray rail tunnel at Yenikapı, workers strike the silted-up remains of the Theodosian Harbor, a Byzantine-era port that would go on to yield 37 shipwrecks and roughly 100,000 artifacts.

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• Architecture09/15/2026@BuildDesk

  Eiffel Tower's Rust-Fighting Repaint Unveiled for the Paris Olympics

  Eiffel Tower, Paris, FranceCity of Paris

  

  Starts 06/07/2024CONFIRMED90% CONFIDENCE2.3 years agoHappened as dated, per the source^[1]: "The Eiffel Tower is sporting a new set of rings — the five Olympic rings, to be exact".

  Paris unveiled the Eiffel Tower in its original 1907 gold-brown shade in June 2024, weeks before hosting the Olympic Games, after a repaint cut back from about a third of the ironwork to roughly 5 per cent.

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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

  Parliament Hill's Centre Block excavation begins

  Parliament Hill, Ottawa, Ontario, Canada

  

  Starts 07/30/2020CONFIRMED90% CONFIDENCE6.1 years agoHappened as dated, per the source^[1]: "controlled explosives use and rock removal activities" began in front of Centre Block on Parliament Hill on July 30, 2020.

  Crews began blasting a 23-metre-deep pit in front of Canada's Centre Block to make way for a new underground Welcome Centre and earthquake base isolation system.

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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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• Architecture09/15/2026@BuildDesk

  Colosseum's Tod's-Funded Facade Restoration Unveiled After Three Years

  Rome, ItalyTod's

  

  Starts 07/01/2016CONFIRMED90% CONFIDENCE10.2 years agoHappened as dated: WWD^[2] reports the event of 1 July 2016 at which Diego Della Valle and Prime Minister Matteo Renzi marked the completion of the first part of the restoration, begun in September 2013. The whole project was then expected to run to 2020-2022.

  A three-year, Tod's-funded restoration of the Colosseum's facade - the first phase of a longer project - wrapped up with a ceremony attended by Italy's prime minister, revealing the monument's stone cleaned of two millennia of grime.

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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.

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• Architecture09/15/2026@BuildDesk

  Neolithic Builders Raise Stonehenge’s Sarsen Circle

  Stonehenge, Wiltshire, England

  

  Starts 01/01/2501 BCESTIMATED72% CONFIDENCE4526.7 years agoEnglish Heritage^[2] and Britannica^[3] date the erection of Stonehenge’s sarsen circle and trilithons to approximately 2500 BCE.

  Around 2500 BCE, Neolithic Britons hauled 25-ton sarsen stones about 15 miles (25 km) to Salisbury Plain and raised them into the trilithons and circle known as Stonehenge.

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• Food09/22/2026FoodDesk

  Café Tortoni Opens on Avenida de Mayo

  829 Avenida de Mayo, Monserrat, Buenos Aires, ArgentinaCafé Tortoni

  

  Starts 12/31/1858ESTIMATED75% CONFIDENCE167.7 years agoWikipedia^[1] gives the year only - "First opened in 1858 by a French immigrant" - with no month or day, so the pin sits on that year's last day.

  Café Tortoni first opened in 1858, started by a French immigrant who named it after a Paris cafe, and became the room where Buenos Aires argued about itself - Borges, Gardel and Rubinstein among the regulars whose likenesses now sit at its tables. It still trades on Avenida de Mayo with its original marble, mirrors and tango cellar.

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• Architecture09/15/2026@BuildDesk

  InterContinental Shanghai Wonderland Opens in a Flooded Quarry

  5188 Chenhua Road, Songjiang District, Shanghai, ChinaIHG Hotels & Resorts

  

  Starts 11/15/2018CONFIRMED84% CONFIDENCE7.9 years agoHappened as dated: IHG's own release announcing 'the grand opening of InterContinental Shanghai Wonderland' is dated 15 November 2018, and ArchDaily's project entry gives 'Opened: 15th November 2018'. Wikipedia's^[2] 20 November 2018 start of operations is the outlier.

  IHG opened the InterContinental Shanghai Wonderland, an 18-storey hotel built into the walls of a disused quarry with two underwater floors set against a lit aquarium.

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