The Cathedral Basilica of Saints Peter and Paul in Philadelphia (Cathedral Basilica of Saints Peter & Paul/Facebook)
Saints Peter and Paul Cathedral is the mother church of the Archdiocese of Philadelphia. It is a national historic monument and the largest Roman Catholic church in Pennsylvania.
The organ's facade was designed by Otto Eggers, who is well known for designing the Jefferson memorial.
Bryn Athyn Cathedral at sunset, taken by Brent Schnarr (Bryn Athyn Cathedral/Facebook)
Bryn Athyn Cathedral is located less than an hour from Philadelphia overlooking the Pennypack Creek Valley in the borough of Bryn Athyn, Pa. The main Cathedral building is Gothic, while the northern and southern buildings are in the early Romanesque style.
Bryn Athyn Church, the largest "New Church" congregation, holds many of its worship services in the cathedral.
A drawing of Christ Church in Philadelphia, circa 1876. (Scribner's Magazine/Wikimedia Commons)
Founded in 1695, Christ Church in Philadelphia is the birthplace of the American Episcopal Church. Talks on the church's rich history are given throughout the day.
This authentic historic site includes a burial ground where the tomb of Benjamin Franklin is located.
The National Shrine of St. John Neumann at 1019 North Fifth Street. (National Shrine of St. John Neumann/Facebook)
The National Shrine of St. John Neumann in Northern Liberties is a Roman Catholic National shrine honoring St. John Neumann, the fourth Bishop of Philadelphia.
In 1977, Pope Paul VI declared John Neumann a Saint in heaven.
Princeton University Chapel in Princeton, N.J. (Wes Ellis/Facebook)
One of the largest university chapels in the world, Princeton University Chapel was designed in 1921 in a collegiate Gothic style. It was built by the university at a cost of $2.3 million.
Martin Luther King, Jr., delivered a sermon there in 1960.