Akihabara, also known as Electric Town, is a major shopping area for electronic, computer, anime and games. I read that it started as a place where street vendors (mostly college students) used to deal in radio parts at the black market just after World War Ⅱ.
Otaku is the Japanese term for what we would call geeks in the US. Some people engage in cosplay (costume play) and dress up as anime or manga characters and walk around the area. This culture inspired some strange things, one being maid cafes, where waitresses dress up in maid costumes and treat customers like masters and serve them food with pictures they have drawn in condiments, and sometimes even spoon-feeding customers. Some customers will pay to just sit and have a conversation with the maids or play cards or video games with them.
It was really cool to see Akihabara around sunset as the neon signs started to light up the area.