i've always loved churches and holy places. spaces used with the intention of worship are special. if you're still enough, you can feel their energy. the more intention towards worship that you bring to that space will obviously make it more sacred for you. here are some spaces i love:
This is the main Hindu temple in New Delhi. No images of holy beings here.
This is Moksha Yoga studio, my home base where I teach and where I've practiced since 2002.
To the right is a medieval church in Toledo, Spain. Just look at the effort.
I also love Chartres in France and the big ass Buddhist sculpture at a monastery in South Korea whose name I forget right now.