Karlstor in Munich is a medieval city gate, which served as a defensive fortification and a checkpoint.
Medieval Neuhauser Tor, complete with moats, barbican and bridges
Modern Karlstor by day, view outbound towards Karlsplatz
Modern Karlstor by night, view inbound towards Neuhauser Straße pedestrian zone
A city gate is a gate which is, or was, set within a city wall. It is a type of fortified gateway.
Kent Gate is a city gate at the ramparts of Quebec.
Depiction of a guard checking a salesperson's papers at a city gate
Bab Agnaou is a city gate in Marrakesh.
Zhengyangmen is a city gate in Beijing.