Along with such monumental religious edifices as St. Mary of the Angels, St. Hedwig's or St. John Cantius, it is one of the many Polish churches that dominate over the Kennedy Expressway in the Pulaski Park neighborhood of Chicago.

Construction of the Kennedy Expressway which cut through the heart of Chicago's Polonia began a period of decline for the parish as many long-time residents were forced to relocate.

Attorney General Robert F. Kennedy attended Mass here as part of the festivities surrounding the annual Polish Constitution Day Parade in 1961.

As a cultural node for Chicago's Polish Community, the church has hosted elected officials from Poland and the United States, such as Robert F. Kennedy and Malgorzata Gosiewska.

A baroque superstructure, constructed primarily of brick and stone, rises above the portico, but the interior segmental arches and the skeletons of the towers are of iron.

This blend of styles is reminiscent of the many churches of Poland built during the Middle Ages and, after being damaged by war or fire, were rebuilt and remodeled to suit later tastes.

The congregation installed memorial plaques in the narthex in 1993 and 1994 to honor Casimir Sztuczko, CSC, the longtime pastor of Holy Trinity who oversaw the building of the current church, and to commemorate the 50th anniversary of the Battle of Monte Cassino, respectively.

Work included installing new copper cupolas the two church towers, new granite tile in the presbytery, and the painting and refurbishing the interior.

Other new depictions include St. Faustina, Cardinala Stefan Wyszynski and August Hlond and Pope John Paul II were added to reflect Saintly cults popular among today's Polish community.

The result is one of the most distinctive and interesting aspects of Holy Trinity, the so-called catacombs, inspired by the underground cemetery meeting places where early Christians met while the religion was still illegal in the Roman Empire.