Here are 5 photos of arched gates that I have come across over recent years.
Malahide, Ireland, 2014
Sevilla, Spain, 2009
New Orleans, Louisiana, USA, 2005
Portland, Oregon, USA, 2012
Shanghai, China, 2012
This is another unintentional series of photos. Had I had the series in mind, I likely would have framed gates more similarly. (Also, I do wish I could go back in time and replace the point-and-shoot camera I was using in 2005 on my trip to New Orleans. I suppose it would also be worthwhile just to go back to New Orleans…)
collecting tokens 
Wow, these are cool. I love the tiles in the Sevilla one, but all of these gates are interesting.