Isis Heiligtum (Isis and Magna Mater Temple) in Mainz, Germany

What do you do when you've built a shopping mall but you find an ancient Roman temple underneath part of it? If you are in Mainz, Germany, you build the mall up around it, but leave it in place to be a hidden museum to the past. This is the "Isis-Heiligtum" (Isis Temple) in Mainz, Germany, preserved in place beneath the Römerpassage shopping mall within an easy 10-minute walk from Mainz…