Like Shah Jahan, he was a great builder. He rebuilt and enlarged the Central Mosque of Damascus. Under his reign Umar bin Abdul Aziz beatified the Holy Cities of Makkah and Madinah.
He also built Mosques at places where no one ever thought of doing so.
He also built forts in many cities, although this may have been expansion strategy.
Hospitals, schools, orphanages, and new markets were built under his reign.
For complete Islamic history notes click here.