Obelisk of Montecitorio

This church was built inside the former baths of Diocletian. Very light and airy inside. Note the unusual art on the outside doors. Around solar noon check out the sun's image on Francesco Bianchini's meridian line inside.

The Collegio Romano was a college of the Jesuit order. Many popes, cardinals and bishops were educated here. Since 1870 it has been a secular (non-monastic) school. The coat of arms on the doorway is that of Pope Gregory XIII (1572–1585). The tower was erected in 1787 and served as an observatory. Until 1925 all clocks in Rome were set after that of the Collegio Romano.

A 19th-century addition to the square, made to balance the Fontana del Moro.

This church was built by the Emperor Constantine (272-337) as a mausoleum for his daughters Constantina and Helena. It was part of a much larger cemetery complex, parts of which can still be seen. The mausoleum was consecrated as a church and dedicated to Constantina when she became a saint in 1254. The building is circular with an inner arcade resting on pairs of granite columns. It retains some marvellous mosaics from the 4th Century.

The mausoleum of Cecilia Metella, who died in 69 BC, is the best preserved monument on the Appian Way and dominates the surroundings. In the Middle Ages it was transformed into a fortress and battlements were added. At that time there was considerable competition for ownership because of its strategic location.

Next door to Santa Croce. A collection of around 3000 pieces, although only a third of these are displayed.

Home of the President of the Italian Republic, and the Quirinal Gardens. Built in 1573 as a papal summer residence, and has since also served as the residence for the pope and later for the king of Italy.

Early Roman houses dating back to the 1st century, believed to be homes of early Christians. Well-preserved frescoes and a small museum.

A 1st-century tomb surrounded by two farmhouses from the Middle Ages, one of which used to be a cheese store. Rather hidden behind a high wall, the tomb is rarely open to the public. You might be lucky on a Sunday: on the third Sunday of every month there is a guided tour at 11:00.

Pope Nicholas III connected Castel Sant'Angelo to St. Peter's by a covered fortified corridor called the Passetto di Borgo. This proved useful for Pope Clement VII during the Sack of Rome (1527). You can still see much of the Passetto by walking along the Borgo Sant'Angelo, which runs parallel to, and north of, the Via della Conciliazione.

A pleasant fountain in an out-of-the-way square. It was originally meant to have four dolphins rather than turtles, but the dolphins proved to be too large for the water pressure, so the turtles were added as an afterthought.

One of the oldest churches in the city. The nave is lined with a mismatched collection of columns taken from ancient Roman buildings. The apse is covered in gold mosaics from the 13th century, arguably the finest mosaics in the city. Impressive mosaics also on the front. According to legend the church was founded in 222, so it would be one of the most ancient churches in the city. Written records mention a church on this place in 337. What is visible today was built in the 12th century, by order of Pope Innocent III. The facade is decorated with mosaics representing the Virgin Mary and ten unidentified figures. Most probably these mosaics are the work of Petro Cavallini who created the mosaics of the lower apse dated 1290 representing scenes from the life of Mary. The mosaics of the upper apse in byzantine style are even older and date from 1140. The columns of the nave originate from the ancient Baths of Caracalla. The facade of Santa Maria in Trastevere is even more impressive at night when it is illuminated.

The first basilica was constructed in the 4th century and dedicated to San Sebastian, a martyr of the 3rd century. Sebastian's remains were transferred to St. Peter's in 826, prior to a Saracen assault when the church was destroyed. The current church was largely constructed in the 17th-century. Until the Great Jubilee in 2000 this was one of the Seven Pilgrim Churches of Rome, i.e. the churches that all Roman Catholic pilgrims were expected to visit. However, at that time it was replaced by the Sanctuary of Divino Amore (see below). Entrance to the catacombs, which are smaller than the others in the area, is to the right of the church entrance. The area where you buy tickets and wait for tours has a good display of sarcophagi from the catacombs. You can rent a bicycle at the catacombs for further exploration of the Appian Way.

This is one of the two main Jesuit churches in Rome, the other being the nearby Sant'Ignazio. The interior is Baroque art on steroids. Simply astounding.

Located a short walk west of the Colosseum, this well-preserved monumental arch was erected (soon after 315) to commemorate the victory of Constantine, the first Christian emperor, over his rival Maxentius at the Battle of the Milvian Bridge in 312. In general design, the Arch of Constantine imitates the century-earlier Arch of Septimius Severus (nearby in the Forum). The three arches are decorated utilizing mainly materials plundered from other imperial monuments by Trajan, Hadrian and Marcus Aurelius. The quality of its sculptural decoration, however, betrays the slow degradation that Classical Roman sculpture had experienced in the 3rd century AD.

This garden was established in 1883. It has over 3,500 species of plants and includes a "Scent-and-Touch" garden for those who are visually impaired.

Perhaps the most fascinating building in Rome. The core of the structure began life as the mausoleum of Emperor Hadrian, built between 135 and 139 AD. Subsequent strongholds built on top of the mausoleum were in turn incorporated into a residence and castle by medieval Popes. The building was used as a prison until 1870 but now houses a museum. Opera buffs will be exhilarated to visit the balcony from which Tosca leaps to her death. Film buffs will recognise it as a setting from Angels and Demons.

In the Middle Ages pilgrims on their way to St. Peter's had to pass through the Via dei Coronari in order to cross the Tiber at Ponte St. Angelo. The street got its name from the people who sold rosaries to the pilgrims. It follows the ancient Via Recta which led from what is today Piazza Colonna to the Tiber. In the 15th century Pope Sixtus IV initiated the construction of private buildings. Today, several houses dating back to the 15th and 16th century may be seen. House nr. 156/157 is said to have been the House of Fiametta, the mistress of Cesare Borgia.