The Colonne di San Lorenzo is the best-known Roman

Roman Empire

The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

 ruin in Milan

Milan

Milan is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza ,...

. It is located in front of the Basilica of San Lorenzo

Basilica of San Lorenzo, Milan

The Basilica of Saint Lawrence is a church in Milan, northern Italy, dedicated to the Christian martyr St. Lawrence.- History :Various suggestions of its origin have been made, including a foundation in c.370., the Basilica of San Lorenzo was renovated and redecorated in the 16th century...

. It is a square with a row of columns on either side, which were taken from a temple

Temple

A temple is a structure reserved for religious or spiritual activities, such as prayer and sacrifice, or analogous rites. A templum constituted a sacred precinct as defined by a priest, or augur. It has the same root as the word "template," a plan in preparation of the building that was marked out...

 or public bath house

Public bathing

Public baths originated from a communal need for cleanliness. The term public may confuse some people, as some types of public baths are restricted depending on membership, gender, religious affiliation, or other reasons. As societies have changed, public baths have been replaced as private bathing...

 dating from the 2nd century. The columns were moved to their current location sometime in the 4th century. South of the columns, one of the medieval gates of the city is still in place, with Roman marbles in it.
Up until 1935, the space between the church and columns was entirely occupied by old houses abutting onto the façade of the church itself. Indeed, the church complex was fully surrounded by old houses. Despite the plans to conserve this ancient urban fabric, the renovations led to the demolition of the old houses and the isolation of the monument on the front side. Following bombing during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, the church complex became isolated also on the rear side, where a fenced urban park (which is called Basilicas Park or Parco delle Basiliche in Italian

Italian language

Italian is a Romance language spoken mainly in Europe: Italy, Switzerland, San Marino, Vatican City, by minorities in Malta, Monaco, Croatia, Slovenia, France, Libya, Eritrea, and Somalia, and by immigrant communities in the Americas and Australia...

) now stands, allowing popular views of the complex and of another church nearby.