Some of the great locations for photography are the churches and cathedrals of Europe. In these magnificent structures, you can find history, architecture and art.
There is so much to see that I will probably follow with a "Part Two" and maybe even a "Part Three".
One thing I would like to impress upon those who chose to photograph in one of these houses of worship, is that is exactly what they are. There are rules and they are posted at the entrance and sometimes, with several reminders inside. Failure to stick to the rules, whether you agree or not may cause problems for yourself and ruin the experience for others.
Selfie Sticks can be dangerous to people and art when extended in crowded small places. This is why some churches ban them entirely. Flash photography is always banned. A flash is comparable to daylight and church lighting is subdued to protect the artwork and structure. Some of the sculptures and paintings have been preserved for centuries, no need to hasten their demise with modern technology. Do not touch, means "Do Not Touch". You may find yourself waiting outside for your friends.
Men, remove hats and women do not be surprised if you are handed covering for your shoulders or a wrap to cover your legs if you are wearing shorts.
...And remember that these are places of worship. There are areas set aside for prayer and religious services. These are usually roped off or protected by a security guard. Whisper or at least keep your voice down.
Here are some examples of these beautiful and elaborate structures. (Images are clickable for larger viewing)