THE SITE OF THE MUSEUM OF TOLERANCE is associated with a gruesome ancient episode according to the Jerusalem Post:

Massacre at Mamilla
By GIL ZOHAR

Completely overlooked in the current media frenzy about building the Museum of Tolerance atop the millennium-old Ma'amun Allah Cemetery is the site's forgotten history as the killing field of 614.

In that year, nearly three centuries of prosperity under the Byzantine empire were shattered by Persia's Sassanid Shah Khosrau II, known as Parvez - the Victorious.

Local Jews together with their co-religionists in Babylonia allied with the Zoroastrian invaders to defeat the Christian rulers. Seeking revenge for generations of persecution, the Jews destroyed hundreds of churches and monasteries.

[...]

"Once Jerusalem was in Persian hands a terrible massacre of Christians took place, and the Jews are accused of having taken the lead in this massacre. It would not be surprising if the accusation were true, even though the fantastic stories told of Jewish revenge by Christian chroniclers are certainly exaggerated."

How many Christian prisoners of war were murdered by the Mamilla Pool? A precise number is of course now impossible to verify, but Israeli archaeologist Ronny Reich puts the tally at 60,000 before the Persian military stopped the carnage.

[...]

The quotation is from historian James Parkes.