Holy places

St. Nicholas Church, Hamburg

The bombing of Hamburg in World War II destroyed the bulk of the church. The removal of the rubble left only its crypt, its site and tall-spired tower, largely hollow save for a large set of bells. These ruins continue to serve as a memorial and an important architectural landmark. --wikipedia

Sagrada Família

cathedral in Barcelona, Spain, that was designed by Antonio Gaudí. Begun in 1882 and still unfinished -- britannica.com

Hagia Sophia, Istanbul

Originally a Greek Orthodox cathedral from AD 532, the site has changed between being a mosque and a museum since the fall of the Byzantine Empire. It is currently a mosque --wikipedia

Frauenkirche (Cathedral of Our Dear Lady), Munich

I visited here, today, so I have some additional calibrations, including the rendering of Christ on the cross and the crypt chapel.