Prague Castle, Prague, Czech Republic

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  Palais Garnier, Paris, France

  April 7, 2016

  Palais Garnier, Paris, France, photo by Wendy via Flickr. https://www.flickr.com/photos/wenzday01/

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  Peles Castle, Sinaia, Romania

  April 7, 2016

  Peles Castle, Sinaia, Romania, photo by Marc Osborn. https://www.markosbornphotography.com/

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  Sacré Coeur, Montmartre, Paris, France

  April 7, 2016

  Sacré Coeur, Montmartre, Paris, France, photo by Laurent photography via Flickr. https://www.flickr.com/photos/laurent_photography/