When you visit the Coliseum in Rome, your guide may casually mention that it was built by 20,000 Jewish slaves, brought back after the Romans destroyed Jerusalem and the Second Temple.   The Emperor Titus brought 20,000 Jewish slaves to Rome, slaves used to build the Coliseum. Proof of this lies in the Arch of Titus, which depicts a menorah as part of the bounty from Jerusalem. To this day, the Talmud forbids Jews from walking under the Arch!