Go Green: London, Paris & Rome

Step outside your hotel, for a stroll through the streets of the heart of the English-speaking world. In this city of nearly seven million, you'll see everything from 12th-century fortifications to modern skyscrapers, formal parks to punk rockers. Your Tour Director will lead you to some of the most famous sites. Walk along the Thames River. Cross Trafalgar Square. See bustling Piccadilly Circus. Pass trendy shops and cafés in Bohemian Soho on your way to Covent Garden, a 13th-century fruit and vegetable garden transformed into a maze of narrow streets and pedestrian walkways burgeoning with street performers, open-air markets and boutiques.

Located in an impressive domed building right in Trafalgar Square, the National Gallery houses a rich collection of over 2,000 works of art dating from the mid 13th century to 1900. Explore the beautiful marble hallways to see famous paintings by van Eyck, Turner and Van Gogh.

Nothing's more British than fish and chips-there are eight fish and chips shops ("chippies") for every McDonald's in the county. Head to an authentic pub with your Tour Director for a taste of this national food, generally served with malt vinegar.

Join a licensed local guide for an in-depth look at London, from the royal haunt of Buckingham Palace (the official London residence of Queen Elizabeth II) to the changing of the guard (season permitting), the clock tower of Big Ben with its 14-ton bell, and Westminster Abbey, where almost every English king and queen since William the Conqueror has been crowned. After a stop at the Houses of Parliament, continue on to the magnificent St. Paul’s Cathedral, the masterpiece of London architect Christopher Wren.

Get up close and personal with the Tower of London. Towers, rather. Twenty stone towers, as well as tunnels, winding staircases and narrow passageways comprise this huge fortress covering 18 acres on the banks of the Thames. A royal residence from the 11th - 16th centuries, the Tower also served as a jewel safe and a prison. Scary: The headless skeletons of Anne Boleyn and Catherine Howard (Henry VIII's former wives who were executed here) are believed to be buried here. Shiny: The Crown Jewels are housed here, including the largest cut diamond in the world (530-carats). Safe: Beefeaters (guards) lead tours through the Tower.

Explore the backstreets of the East End, where the world’s most renowned serial killer attacked his victims. Jack the Ripper killed at least five, and maybe as many as eleven, prostitutes in foggy Victorian London. His identity has never been determined -- maybe you’ll pick up a few clues and solve the mystery yourself.

Take the Eurostar under the English Channel. Faster than you can say... anything, in French, you'll whiz through a tunnel and arrive in Paris.

This city was made for walking. Stroll grand boulevards with sweeping views of the city, pristine parks with trees planted in perfect rows, and narrow streets crowded with vendors selling flowers, pastries and cheese. Then head to the Île de la Cité, a small island in the Seine, to see Notre Dame Cathedral. Look up at the great stone buttresses, grotesque gargoyles, and massive stained-glass windows.

Visit one of the original college towns. The famous Sorbonne is the first and most illustrious of French universities. It was originally founded by Robert de Sorbon in 1253 and was actually one of the smallest colleges, but became the richest and most respected of the colleges of the university of Paris. Since the Sorbonne’s founding in the 1100s, the Left Bank has attracted not only intellectuals but also the cafés, bookstores, and cinemas that tend to accompany them. It’s also attracted its fair share of famous residents like Ernest Hemingway.

The curious have been touring the Paris sewers since the 1850’s. Visit what Victor Hugo called the Paris below Paris, “…a Paris of sewers; which has its streets, its crossings, its squares, its blind alleys, its arteries, and its circulation, which is slime, minus the human form." Experience the Paris Sewers Museum, which is located beneath the Quai d’Orsay on the Left Bank, is a popular destination for anyone interested in how a major metropolitan city manages its waste and water recycling.

The steep hilly area of Montmartre has been associated with artists for years. The name Montmartre is attributed to the many martyrs that were tortured and killed here.

The world's largest art museum, the Louvre is housed in a medieval fortress-turned-castle so grand it's worth a tour itself. You walk through the 71-foot glass pyramid designed by I.M. Pei and added in 1989, and step into another world-one with carved ceilings, deep-set windows, and so many architectural details, you could spend a week just admiring the rooms. But check out the art on the walls. The Mona Lisa is here, as well as the Venus de Milo and Winged Victory (the headless statue, circa 200 BC, discovered at Samothrace). The Louvre has seven different departments of paintings, prints, drawings, sculptures and antiquities. Don't miss the Egyptian collection, complete with creepy sarcophagi, or the collection of Greek ceramics, one of the largest in the world. (Please note the Louvre is closed on Tuesdays.)

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 that required the flooding of the amphitheater 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. 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?

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 (if you stand on the circles marked on the ground, the rows will line up and look like a single row); 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 -- look for his name carved into the Madonna’s sash) 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.