Assuming it's a street, I should look at typical features of Czech cities. The Czech Republic has beautiful historic architecture, with cities like Prague being well-known. Streets in Czech towns often have cobblestones, Gothic or Baroque buildings, and maybe some local culture or history. If Petra is a street, maybe it's in a city like Prague, Brno, Ostrava, or another city. Alternatively, "Petra" could be part of a name, like a person, but without more context, it's safer to assume it's a street.