Piazza Venezia and Altare della Patria
The Altare della Patria (Altar of the Fatherland) is a massive white marble monument on Piazza Venezia, built in honor of Victor Emmanuel II, the first king of unified Italy. Free to enter.
Cave in Rome
The Catacombs of San Callisto on the Appian Way are the largest and most important Christian catacombs in Rome, stretching 20 kilometers underground on four levels with the remains of half a million early Christians. Entry is paid (guided tours only). The catacombs contain the Crypt of the Popes (where nine 3rd-century popes are buried) and early Christian frescoes. Budget travelers combine the catacombs with the Appian Way walk for a half day that covers 2,000 years of Roman death and burial.
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Other places worth the walk, and what each one costs.
The Altare della Patria (Altar of the Fatherland) is a massive white marble monument on Piazza Venezia, built in honor of Victor Emmanuel II, the first king of unified Italy. Free to enter.
The Appian Way (Via Appia Antica) is the ancient Roman road leading south from the city, lined with ruins, tombs, catacombs, and cypress trees. Free to walk.
The Aventine Keyhole is a small bronze keyhole in the door of the Priory of the Knights of Malta on the Aventine Hill. Free.
Campo de' Fiori is a lively square in the historic center that hosts a daily morning market selling fruit, vegetables, flowers, spices, and street food. Free to browse.
Castel Sant'Angelo is a cylindrical fortress on the Tiber, originally built as Emperor Hadrian's mausoleum. Entry is paid at a modest price.
The Colosseum is the defining ruin of the Roman Empire, a 50,000-seat amphitheater built for gladiatorial combat and public spectacles. Entry is paid, with a combo ticket that includes the Roman Forum and Palatine Hill.
Working out what Rome costs?
The whole of Rome