That is the Church of St. Ludmila

It took some guts and engineering courage to build a subway tunnel under such an historic building as THAT! Of course, by their standards, a 121 year old church is nothin.

Those of us from the USA (or even Canada) cannot conceive of the thrill of walking by a building that has been standing for 600 years. (This one is not nearly that old, but my point is still valid, you will likely go by those 5 times older in your travels.)