Question: where not to go in mexico city?
Answer: Tepito. Tepito, essentially the black market of Mexico City, is one of those places that has a dicey reputation for a reason. ... 
La Merced Market. ... 
Doctores. ... 
Iztapalapa. ... 
Colonia Del Valle. ... 
Tlalpan, Xochimilco and Tlatelolco. ... 
Centro Histórico. ... 
Ciudad Neza.