Built in the 6th century

Ab: Around 550 Became Capital Of A Vast Empire

Following The Destruction Of The Statues In 2001, Carbon Dating Of Organic Internal Structural Components Found In The Rubble Has Determined That The Two Buddhas Were Built Circa Ad 600, With Narrow Dates Of Between Ad 544 To 595 For The 38 Meter "Eastern Buddha", And Between Ad 591 And 644 For The Larger "Western Buddha".
See En.Wikipedia.Org

Byzantine Empire: Hagia Sophia (532-537)

Having Been Used For Its Initial Function Without Interruption Since The 6th Century

The Age Of The 5 Designated Falaj Is Unknown, Though "The Present Network Appears To Result From Several Building Campaigns, The Earliest Of Which Could Be Around 500 Ad" (Ab Ev)

Ruled From The End Of 6th Century, The Remaining Monuments Originate Mostly From The 7th And 8th Centuries

Frozen Around 590

The Site Became A Royal Zoroastrian Sanctuary Under Khosrow I (531-579) And Khosrow Ii (591-628), And It Was The Most Important Of The Three Main Zoroastrians Sanctuaries. (Ab Ev)

The Age Of The Caves Is Debated. The Archaeological Survey Of India States "There Are Seven Cave Excavations In The Elephanta Group And These Are Datable From Circa 6th - 7th Centuries A.D." . Wiki Places Them At "Between The 5th And 8th Centuries".

Present Church Was Built In The Mid-6th Century

The Apogee Of Calakmul Is Considered To Have Been In The Late Classic Period (542-695 Ce). There Are A Few Remaining Earlier Structures.

Principal Buildings Were Built Between 500 And 700, When The City Was At Its Peak (Ab Ev)

"In The Mid 6th Century The Holy Man Millan Settled At A Site, Now Known As The Suso ("Upper" Or "Above") Monastery,....... During The Lifetime Of The Saint A Small Mnonastery Was Built On The Hillside In Visigothic Style. This Was Enlarged In The 7th Century...The Church Was Rebuilt In 929.....". Yuso Was Built In The 16th Century" Well Which Would You Choose? Could Have A Separate One For Yuso As Well. Seems To Me That The "Heart" Of The Site Is The Original Suso Cave Etc Of 6th C

Earliest Settlement

St. Martin's Church + Kingdom Of Kent's Conversion To Christianity In 597. The Cathedral Was Founded In 602

In The Early 6th Century Ad, Buthrotum Became The Seat Of A Bishop And New Construction Included A Large Baptistry, One Of The Largest Such Paleochristian Buildings Of Its Type, And A Basilica. (Wiki)

Cathedral Of Bosra Was Finished In 513; Visit By The (Later) Prophet Muhammad (582)

Hypogea Were Built Between 500 And 900

El Silencio (From 550 On)

The Capital City Of The First Empire And First Khmer State In The Late 6th And Early 7th Centuries Ce (Ab Ev)

Exceptional Testimony To An Extinct Insular Culture That Seems To Have Evolved In Isolation For More Than 1500 Years (Ab Ev)

"The Distinctive Qualities Of Dvaravati Sculptures Found Here Have Been Given The Name Of Si Thep School Of Art, Which Emerged Between The 6th And 8th Centuries." (Ab Ev)