Baroque-en hearted? Revive your spirits with a walk past Rome's most beautiful and unusual Baroque fountains. At the foot of the Spanish Steps, elegant cafes once favored by visiting Brits and Americans surround the central fountain. The water pressure here was so low that the artist had to sink the fountain into the ground to get any water going through it, so he went ahead and designed the fountain to look like a sinking ship. There's no shortage of water pressure at the nearby Trevi Fountain, a Baroque extravagance designed by master sculptor Bernini. At the Pantheon, you'll see the largest concrete dome ever constructed. An oculus, or hole, in the dome lets sunlight into the beautiful temple, dedicated to all the gods.

Don a state-of-the-art headset for a space-age tour of St. Peter’s Basilica with a licensed local guide. Outside the church, four rows of columns radiate out like welcoming arms; inside, the church seems enormous enough to embrace the entire world. The dome, partially designed by Michelangelo, rises 452 feet above the ground. Michelangelo’s mark is everywhere here, from the costumes worn by the Swiss Guards to his exquisite “Pietà” sculpture (the only sculpture he ever signed) to the amazing frescoes of the Sistine Chapel. Because he considered himself a sculptor and not a painter, Michelangelo hated working on these paintings, now considered masterpieces.

The ultimate symbol of Ancient Rome, the Colosseum still dominates the modern city. Tour the amphitheater with your local licensed guide. Built by the emperor Vespasian in A.D. 72, the structure held almost 50,000 spectators but was so well organized that the entire place could be emptied within 15 minutes. Inside, the spectacles varied from gladiator battles to immense naval contests to wild beast shows, in which thousands of exotic animals like giraffes and ostriches were popped into the stadium through trap doors and left to fight Roman hunters. See the system beneath the floor that operated the trap doors and housed the animals, then continue on to the relative calm of the Forum. Ancient Rome’s commercial, religious and political center, the Forum held markets, temples and the Senate House. Near the Rostra, or speaker’s platform, you can still see game boards scratched into the marble by bored politicians--anyone up for a game of tic tac toe?

You may think Rome has a lot of fountains, but you really haven’t seen anything until you’ve been to Tivoli. See the Villa d’Este, the 16th-century home of Emperor Alexander IV’s nephew, the Cardinal Ippolito d’Este. In the magnificent gardens, five hundred fountains gurgle, burble and cascade over statues, canals, grottoes, staircases and reflecting pools.

Descend into the early Christian catacombs, dating from the first to fourth centuries. Thousands of Christians, including Saints Peter and Paul and several popes, were entombed here at one time. There are still signs of early Christianity, including frescoes of fish and doves and inscriptions on the tombs themselves. Overhead runs the Appian Way, the world’s first real highway, which stretched southeast over 350 miles from Rome. Then experience a day in the life of a gladiator in ancient Rome. Through demonstrations and workshops, you'll see how the gladiators lived, trained and more.