These are images from the Saint John Co-Cathedral in Valletta Malta. It was built between 1572 and 1577 and really shines with gold gilding everywhere and magnificent artwork. One of the masterpieces that hangs here is Caravaggio's "Beheading of St John the Baptist". It's a bit gruesome but an utterly fantastic piece that you must check out on Google. Photography is absolutely FORBIDDEN at the painting. They literally have a security guard watching your every move. The rest of the interior is absolutely fine to photograph and I took dozens of images while walking around in awe.
Techy type stuff: The interiors of cathedrals are notoriously tough to photograph since there's not much light to work with. The deal is that manual exposure works best. Shutter speed of 1/125 to prevent camera shake, fairly wide aperture to get light in, and finally, a very high ISO. Think 3200 or 6400.