Medieval towns had two types of access: the main one called 'Porta' (gate) and the secondary one called “Pusterla” (or “Pustierla”). Lodi historical tradition claims, and affirms, that it was from this place that Emperor Frederick Barbarossa Hohenstaufen mapped out the boundaries of the new city and that his palace was actually built nearby. Around the end of the 18th century, when the road system was rearranged, it was replaced by one known as Porta Nuova or Porta Milano, built in the neoclassical style. This was actually a double gate forming a double corner in today's Piazzale Tre Agosto; it was destroyed as Porta d'Adda in 1912.

A plaque still commemorates the maximum height of the Colle Eghezzone (or “Mons Gezonis”).