Senlin Ascends by Josiah Bancroft.

Hello all.  Summary:  Senlin, a mild-mannered school teacher, is drawn to the Tower of Babel by the grandiose promises of a guidebook. The ancient and immense Tower seems the perfect destination for a honeymoon. But soon after arriving, Senlin loses his young wife, Marya, in the crowd.  Senlin’s search for Marya carries him through slums…