Nature and sacred spaces — two places where we sense what Rudolf Otto called, 'The Numinous,' or the Holy. He characterized this experience, available to anyone, as "Mysterium tremendum et fascinans" — the mysterious, the tremendous, the fascinating. You can read more about it in "The Idea of the Holy" by Rudolf Otto.

1. Photo by Dom Crossley - http://www.flickr.com/photos/flashcurd/6298979599/

2. Photo by Alex - http://www.flickr.com/photos/ajagendorf25/1173188089/

3. Photo by Schezar - http://www.flickr.com/photos/rym/11166188233/

4. Photo by Matthew Sharp - http://www.flickr.com/photos/matthewpsharp/4849942314/

5. Photo by Jeff P - http://www.flickr.com/photos/jeffpang/3698744747/

6. Photo by Granger Meador - http://www.flickr.com/photos/gmeador/5798923774/

7. Photo by Lawrence Murray - http://www.flickr.com/photos/lawmurray/3074978874/

8. Photo by erick espinosa - http://www.flickr.com/photos/epfi/3367282607/

9. Photo by Khalid Almasoud - http://www.flickr.com/photos/khalid-almasoud/447141825/

10. Photo by David DeHetre - http://www.flickr.com/photos/davedehetre/5658797697/

11. Photo by Simon Bradley - http://www.flickr.com/photos/squiffy/244862020/

12. Photo by Steve Arnold - http://www.flickr.com/photos/stevoarnold/3161660942/

13. Photo by Luigi Torreggiani - http://www.flickr.com/photos/torremountain/3331684042/