I traveled through hundreds of worlds at once

In the center of City A, there is a building that seems to be made of black translucent metal. The building is much taller than the surrounding buildings of City A. It is like a giant standing in the urban cluster, and can see the entire City A at a glance. However, this towering building does not have any windows, just like a square black metal body.

The unique shape that stands out from the crowd is extremely conspicuous. In addition to the unique shape, this windowless metal building is an extremely solid fortress. Even if it is bombed by nuclear weapons, it will not be shaken. And the building with such strong defense has a