The keys to the cathedral: As he locks the front gate at the end of an after-hours tour, the security guard fans out the impressive array of keys required to unlock an equally impressive array of locks (I’m sure) at St. Mark’s Basilica in Venice, Italy. Picture taken Oct. 14, 2015. Nikon D7100. RAW. Nikkor 18.0-55.0 mm f/3.5-5.6. 1/15 sec. f/4.2. ISO 1600. 26mm (DX 39mm). Click on image to enlarge.