4th millennium BC in architecture

• Sialk ziggurat near Kashan, Iran (3200BCE){{Cite journal|title = The Balance of Trade in Southwestern Asia in the Mid-Third Millennium B.C. [and Comments and Reply]|jstor = 2741769|journal = Current Anthropology|date = 1978-09-01|pages = 463–492|volume = 19|issue = 3|first = Philip L.|last = Kohl|first2 = Lucien R.|last2 = Bäck|first3 = Henri J. M.|last3 = Claessen|first4 = Antonio|last4 = Gilman|first5 = Christopher L.|last5 = Hamlin|first6 = Kensaku|last6 = Hayashi|first7 = C. C.|last7 = Lamberg-Karlovsky|first8 = Hans J.|last8 = Nissen|first9 = Joan|last9 = Oates|doi=10.1086/202136}}
• Ġgantija – megalithic temple complex on the island of Gozo (part of Malta, c.3600–2500 BCE)
• Harappa – fortified city of the Indus Valley civilization with as many as 40,000 residents (3300–1600 BCE)

File:Knapofhowarinsun.jpg on Orkney island]]

• Northern Europe
• Céide Fields – oldest known field systems in the world, located in West Ireland
• Brú na Bóinne complex – Neolithic passage tombs in County Meath, Ireland (c.3300–2900 BCE)
• Knap of Howar – oldest preserved stone house in northern Europe, on the Orkney island of Papa Westray occupied from 3500 to 3100 BCE
• Skara Brae – Europe's most complete Neolithic village located in the Bay of Skaill in Orkney, Scotland
• Stonehenge – the earliest phase of the monument has been dated to about 3100 BCE
• Sweet Track – oldest known engineered roadway located in Shapwick, Somerset, England (3806 BCE)

• Timeline of architecture

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