Row of Torii
A torii (鳥居 lit. bird perch) is a traditional Japanese gate most commonly found at the entrance of or within a Shinto shrine, where it symbolically marks the transition from the sacred to the profane. The presence of a torii at the entrance is usually the simplest way to identify Shinto shrines.
Torii were traditionally made from wood or stone, but today they can be also made of reinforced concrete, copper, stainless steel or other materials. They are usually either unpainted or painted vermilion with a black upper lintel. Inari shrines typically have many torii. – wikipedia
Spotted this lovely path full of torii in the middle of Ueno park, in Tokyo. I am not really sure about it, but it seems this kind of row of torii marks the entrance, or the way to an Inari shinto shrine.