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.

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. 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.)

What's that huge white arch at the end of the Champs-Élysées? The Arc de Triomphe, commissioned by Napoleon in 1806 after his victory at Austerlitz. Your licensed local guide will elaborate on this, and other Parisian landmarks. See some of the most famous sites, including the ornate, 19th-century Opera, the Presidential residence, the ultra-chic shops of the Rue du Faubourg St-Honoré, and the gardens of the Tuileries. You'll pass the Place de la Concorde, where in the center you’ll find the Obelisk of Luxor, a gift from Egypt in 1836, and the Place Vendôme, a huge square surrounded by 17th-century buildings. Spot chic locals (and tons of tourists) strolling the Champs-Élysées. Look up at the iron girders of the Eiffel Tower, built for the 1889 World's Fair to commemorate the centenary of the French Revolution. See Les Invalides (a refuge for war wounded), the École Militaire (Napoleon's alma mater), and the Conciergerie (the prison where Marie Antoinette was kept during the French Revolution).

See the city from the water on an hour-long cruise along the River Seine. The Seine cuts right through Paris, dividing the city in half. See the Eiffel tower rising up on the Left Bank, the walls of the Louvre on the Right Bank. A guide will point out other monuments and architectural marvels as you pass, many of which are illuminated by clear white light at night.

Guten Tag and bonjour. The capital of Alsace-Lorraine, Strasbourg embodies the best of the German and French cultures once battling to control the area. Join a local licensed guide for a walking tour of Petite France, Strasbourg’s medieval quarter. The magnificently Gothic Notre Dame cathedral is the city’s spiritual center, while in the adjoining square the elaborately carved Maison Kammerzell, once a wealthy merchant’s house, gives evidence of Strasbourg’s healthy economic history.

Although construction began in the 11th century, this cathedral was completed in 1439. This sandstone structure is a combination of Romanesque (the choir) and Gothic (the nave) architecture.

Explore a portion of the immense Maginot Line, a system of fortifications extending along France’s eastern borders. Designed with the slow-moving trench warfare of World War I in mind, the fortifications could not repel the bombs and tanks of the German army during World War II and therefore ultimately failed to protect France from invasion. Your Tour Director will show you the inner workings of the largest fort, Hackenberg, whose underground vaults included hospitals, trains for moving ammunition and soldiers, kitchens, barracks, and more. Then continue on to Colmar, a well-preserved 16th-century trading town where flowered bridges, half-timbered houses, and picturesque canals will make thoughts of war seem very far away.

Christmas reigns all year round in Rothenburg, a jewel of a town on Germany’s picturesque Romantic Road. Beyond the year-round Christmas markets, the town boasts one of the most intact medieval city walls in Europe and a fairly unique clock. During the Thirty Years’ War, a former Rothenburg mayor was offered the chance to save the city by chugging close to a gallon of wine; he succeeded (and then slept for three days straight), and his accomplishment is reenacted seven times daily by mechanical figures on the clock in the Marktplatz -- adding a new twist to the concept of “cuckoo clock.” The enormous Gothic St. Jacob’s Church watches over the exploits from across the square.

Surrounded by mountains, forests, and the Neckar River, Heidelberg showcases a quintessential German landscape. Join your Tour Director as you drive through this granddaddy of all college towns, with its scores of bars, cafés, and shops. Get a beautiful view Germany’s oldest university —founded in 1386—from the Marktplatz, Heidelberg’s main square. Notice that behind the university lurks the Students’ Prison, used from 1778 until 1914 to imprison students for up to four weeks for minor offenses like drunkenness, practical jokes, and dueling. (Imprisoned students still had to attend lectures — think of it as the 19th-century equivalent of being grounded.) Then head up to Heidelberg Castle, which is still a little wobbly from its partial destruction during the Thirty Years’ War, a 17th-century attack by the French, and a major lightening hit in 1764. The castle’s courtyard is home to the largest wine barrel in world, the Great Vat, which holds about 50,000 gallons of wine (possibly another contributing factor to the castle’s romantically off-balance appearance).