Basilica dei Santi XII Apostoli
15th Century church in the Rione Trevi dedicated to the 12 Apostles with relics of two of the Aposltes, Sts. Phillip and James the Lesser
Basilica di Santa Stefano Rotondo al Celio
An early Christian church dedicated to deacon and first martyr St. Stephan, is located on the Celio, one of the highest of the legendary seven hills of Rome
Basilica of Saint Anastasia al Palatino
The basilica stands on Roman archictecture, with the remains under the church. The small church was reformed many times throughout the years. It has one of the more simple exterior designs in Rome, yet still holds plenty of beauty through the two bells towers and in the interior of the church. Inside you will find beautiful art of the Martyrdom of Saint Anastasia by Michelangelo Cerruti, and Saint john the Baptist in the desert by Pier Francesco Mola. Unlike many other churches, it has three naves you can walk down. 
Basilica of Saint Cecilia
The Basilica of Saint Cecilia, who is the patron saint of musicians, was built where her family lived. She was martyred around 230 A.D. when she tried converting her husband and brother. Because of her efforts, she was tortured for three days in the calidarium. However, she was still alive, so her torturers decapitated her. Pope Urban I, who witnessed the martyrdom, buried her in the catacomb of St. Callistus. Years later, Pope Paschal found her body and moved to a basilica in Trastevere, which is now named after her. As time past, the basilica had numerous work done. Between the 12th and 13th century, the cloister, atrium, and bell tower were added. In the 16th century the entrance to the building was added on with its ancient columns of pink granite and African marble by Ferdinando Fuga. 
Basilica of Saint Francesca Romana
The basilica is dedicated to the Benedictine nun and patron saint of drivers, Saint Francesca Romana. The nun became a saint because of her service to the poor and sick people. As you enter her church, the main interior focal points are the nave decorated with a mosaic, seven side chapels, and a wooden coffered ceiling with decorative panels. Another eye-catching piece of art is the hodegetria (means she who shows the way) icon above the altar. 
Basilica of Saint Maria in Aracoeli
Going up the staircases, designed by architect Vignola, is the Basilica of Saint Maria in Aracoeli (near Capitoline Hill), which in english means Altar of Heaven. It is on the highest peak of Capitoline Hill, to honor the Virgin Mary. Before entering the church, a fresco of Mother Mary and baby Jesus is right outside the gate. Entering the church are beautiful works of art by Cavallini, Donatello, Pinturicchio, Benozzo Gozzoli, and Gian Lorenzo Bernini. The church was founded by Pope Gregory the Great.
Basilica of San Clemente
Home of Saint Clement
Basilica of San Marco
The Basilica of San Marco near Capitoline Hill, was founded by Pope Marco in 336, and dedicated to Marco the Evangelist, who lived at the Hill during his time in Rome. The church has had many renovations, especially after the barbarian invasions in the 6th and 7th centuries. One of the most important pieces in the church is the mosaic, designed by byzantine artists who were commissioned by Pope Gregory IV. Between 1455 and 1471, the ceiling of the church was also decorated and remains one of the only remaining coffered ceiling still undamaged.
Basilica of San Paolo alla Regola
Built over One of the Houses of St. Paul
Basilica of San Pietro in Vincoli
Early Christian Church holding the Chains of St. Peter
Basilica of Sant'Andrea della Valle ( St. Andrew of the Valley)
From Peretti to Maderno: The Architectural Brilliance of Sant'Andrea della Valle
Basilica of Santa Maria in Trastevere
The Magnificent Mosaics and Medieval Marvels of Santa Maria in Trastevere
Basilica of Santa Maria Sopra Minerva
Gothic church and resting place of Saint Catherine of Siena
Basilica of Santa Sabina all'Aventino
5th Century Basilica and Dominican Mother Church
Basilica of Sant’Agostino in Campo Marzio
Tomb of St. Monica: Rome’s First Renaissance Style Church
Basilica of St. Bartholomew on Tiber Island
Titular and Minor Basilica Hosting the Relics of St. Bartholomew the Apostle and Martyr
Basilica of St. Mary of the Angels and the Martyrs
From Roman Baths to Basilica Honoring Christian Martyrs 
Basilica of Sts. Cosmas and Damian
Medieval Church built over the Roman Forum & Temple of Romulus
Basilica of the Holy Cross in Jerusalem
Home of Saint Helena's Treasures
Catacombs of Domitilla (Rome's Largest Catacomb)
Martyrs and Mosaics: Rome's Largest Underground Cemetery
Catacombs of Priscilla (Earliest Image of Mary)
Earliest Depiction of the Virgin Mary: Saints in the Catacombs of Priscilla
Catacombs of St. Callixtus
St. Callixtus Catacombs: The Little Vatican Beneath Rome's Streets
Catacombs of St. Sebastian
Constantine's Basilica and the Catacombs of St. Sebastian
Chiesa del Gesú
Mother Church of the Society of Jesus. Tomb of St. Ignatius of Loyola & Relics of St. Francis Xavier
Chiesa Nuova (S. Maria in Vallicella)
Baroque Church and resting place of St. Philip Neri, Apostle of Rome
Church of Saint Ignatius of Loyola
Church of Saint Jerome of Charity
House of St. Jerome & Iconic Spada Chapel
Church of Saint Joachim 'in Prati'
Beautiful Church Built in Honor of Joachim, the Virgin Mary's Father
Church of San Bonaventura al Palatino
The church is dedicated to Saint Bonaventura, a Francisan father. Cardinal Francesco Barberini had it built in 1675 next to a convent for the Franciscan Friars Minor. The church is among the smallest in Rome. The interior consists of one nave. Saint Bonaventura's tomb as well as San Leonardo from Porto Maurizio are held in the church.
Church of San Giacomo in Augusta
Former Hospital Chapel Serving Sick Pilgrims to Titular Church Dedicated to St. James the Great  
Church of San Luigi dei Francesi
French National Church & Iconic Paintings by Caravaggio of St. Matthew
Church of San Pietro in Montorio
Bramante's Tempietto on the Gianicolo with a Via Crucis
Church of San Salvatore in Lauro
Shrine of Our Lady of Loreto in Rome & St. Padre Pio Relics
Church of Sant'Agata dei Goti
Dedicated to the wold famous martyr, St. Agatha, home of the Benedictines
Church of Sant'Anna dei Palafrenieri (St. Anne)
Vatican's Parish Open to the Public with Frequent Mass Times
Church of Sant'Ignazio di Loyola (St. Ignatius)
Baroque style church belonging to the Jesuits featuring an ornate ceiling, tombs of Jesuit saints, and a false dome.  
Church of Santa Maria ai Monti
A Marvelous Church in the Monti District built on the site of an ancient Poor Clare monastery 
Church of Santa Maria dell'Anima
A Hospice to the Pilgrims of  Rome
Church of Santa Maria dell'Archetto
The Smallest Church in Rome
Church of Santa Maria della Pace
Renaissance Church with Cloister & Miraculous Icon
Church of Santa Maria della Vittoria
Carmelite Sanctuary hosting a Miraculous Image of Mary & Bernini's "Ectasy of St. Teresa of Avila"
Church of Santa Maria in Cosmedin
Melchite Rite Church with Relics of St. Valentine and famous "Bocca della Verità"
Church of Santa Maria in Via Lata
Underground House of Sts. Peter and Paul
Church of Santa Prisca
House of Prisca and Aquila, companions of St. Paul
Church of the Gesù
Church of the Holy Spirit in Sassia
Italian Shrine to the Divine Mercy Devotion
Colosseum
A Beloved Icon of Roman History
Mamertine Prison - Church of San Giuseppe dei Falegnami
Mammertine Prison, Location of Sts. Peter and Paul's Imprisonment