9th century in architecture

about 800 – Borobudur temple in Java completed.
802
- Haeinsa of Korea, is constructed.
- Palace of Charlemagne in Aachen, Carolingian Empire completed (begun about 790). The Palatine Chapel still stands.
- At Oviedo in the Kingdom of Asturias
  - Cámara Santa constructed.
  - First reconstruction of Oviedo Cathedral begun by Tioda.
815 – Second Temple of Somnath built in the Pratihara Empire, India.
816 – Reims Cathedral begun.
810s – Chapel of San Zeno in Santa Prassede, Rome decorated.
818 – Old Cologne Cathedral built.
820s
- Imperial Abbey of Corvey on the Weser founded.
- Fontanella Abbey reconstructed.
827 – Mosque of Amr ibn al-As in Fustat, Egypt reaches its final form.
c. 830–842 – Construction of basilica church of San Julián de los Prados in Oviedo, Kingdom of Asturias, designed by Tioda.
836
- Samarra founded in Mesopotamia as the capital of the Abbasid Caliphate.
- Great Mosque of Kairouan founded in Aghlabid Tunisia.
838 – Jawsaq Khakani Palace built in Samarra.
840s – Santa María del Naranco Hall, San Miguel de Lillo constructed.
840 – The main pagoda of the Three Pagodas in Dali, Yunnan, China is built.
c. 842 – San Miguel de Lillo in Oviedo, Kingdom of Asturias is built.
847 – St. Peter's Basilica and Basilica of Saint Paul Outside the Walls in Rome partly rebuilt.

848
- First enlargement of the Great Mosque of Cordoba, in the Emirate of Cordoba finished (begun in 832).
- Santa María del Naranco built in Oviedo as part of a palace complex of Ramiro I King of Asturias
c. 850 – Prambanan Temple built in Java.
851 – Great Mosque of Sousse built in Aghlabid Tunisia.
852
- Great Mosque of Samarra and Malwiya Minaret completed (begun in 848).
- Hildesheim Cathedral begun.
c. 854 – Balkuwara Palace of Caliph Al-Mutawakkil built in Samarra.^[1]
855 – Construction of the second Würzburg Cathedral (building no longer existing).
858 – Invading Vikings set fire to the earliest church on the site of Chartres Cathedral, necessitating its reconstruction.
859 – Halberstadt Cathedral constructed.
861 – Abu Dolaf Mosque built in Samarra (begun in 859).
862 – Reims Cathedral constructed.
864 – Cathedral of Santa Maria Assunta on Torcello partly rebuilt.
869 – City walls of Dijon, Le Mans and Tours reconstructed.
c. 870 – Church of St. Apostles Peter and Paul in Serbia is reconstructed.
873 – Imperial Abbey of Corvey begun; church westwork completed c. 885.
875 – Great Mosque of Kairouan in Aghlabid Tunisia reaches its current aspect.
c. 875 – The Great Basilica of Pliska, capital of the First Bulgarian Empire is finished.
879
- Mosque of Ibn Tulun, Fustat, Tulunid Egypt finished (begun in 876; consecrated 884).
- Preah Ko, first temple built in the Khmer Empire capital of Hariharalaya.

880
- The oldest Islamic contraction in Iran, the Tarikhaneh Temple (mosque) in Damghan, is built.^[2]
- Nea Ekklesia church in Constantinople consecrated.
881 – Bakong, first temple mountain built in Hariharalaya.
c. 883–902 – Shankaragaurishvara Temple in Kashmir built.
885 – Chausath Yogini temple is built in Khajuraho, Chandela kingdom.
After 887 – St Mark's Campanile in Venice begun as a watch tower.
893 – Lolei temple in Hariharalaya built.
897 – Reconstruction of Nantes Cathedral begun.
9th century
- Basilica of Sant'Ambrogio in Milan – the right bell-tower; known as "dei Monaci" ("bell tower of the monks"), is constructed.
- Derawar Fort in Bahawalpur, Punjab built.
- Banyunibo Buddhist temple in Java is constructed.
- Church of Holy Trinity, Split (Croatian: Crkva sv. Trojstva) in Split, Croatia.
- Church of the Holy Cross, Nin (Croatian: Crkva svetog Križa) in Nin, Croatia.
- Fortified Church of the Saintes Maries de la Mer in Provence.
Late 9th century – La Foncalada fountain in Oviedo, Asturias constructed.

Buildings and structures