WESTMINSTER. Look for the famous, yet understated black door on this notable street that bears the number "10." It's the residence and office of England's Prime Minister. It has been a beehive of activity through two World Wars as well as during countless celebrations and crises that have affected the British populace. It first became associated with the office of Prime Minister in 1730, and so far, 51 men and one woman serving as PM have called #10 their home at some point in their lives.

KENSINGTON. In 1851, Prince Albert, husband of Queen Victoria, coordinated a Great Exhibition to highlight worldly innovation. Its success led him to propose a permanent hall for such events, but he died in 1861 before it met fruition. The inconsolable queen erected this extravagant monument in his memory. Designed by George Gilbert Scott, the Gothic-styled, medieval-inspired structure included allegorical figures representing Europe, Asia, Africa, and America. Fashioned of granite and marble, the memorial also features a 14-foot statue of the prince himself. Nearby sits Albert Hall, the domed structure that he originally envisioned. Completed in 1871, it hosts both classical and contemporary concerts. TUBE: South Kensington

ST. JAMES'S. Buckingham Palace is a sightseeing must. Queen Victoria moved into the vast mansion in 1837; since then, generations of royals have made the palace their home. Although wandering the grounds and taking photos of the elaborate exterior are always popular, the interior (some of which is open only during summer months) is a treasure trove of art, furniture, sculpture and decorative goods. Walk around the corner to the Royal Mews to see the queen's coaches and horses. Admission is by timed ticket, available by phoning 20-7766-7300 or e-mailing bookinginfo@royalcollection.org.uk. TUBE: Victoria or Green Park or St. James's Park

ST. JAMES'S. Offering a glimpse of a city under siege, these underground chambers illustrate British efforts to thwart German bombs and hostilities during WWII. They're where Prime Minister Winston Churchill led the government, coordinated communications, and held out against Nazi aggressions. The rooms are laid out much as they were when the war ended, complete with furniture, maps, and technology. Churchill lived here at times, and a portion of the museum is devoted to his life and leadership. TUBE: Westminster or St. James's Park

BLOOMSBURY. Enthusiasts of English literature find much to appreciate in this fine home, the only one of Charles Dickens' residences still remaining. "Oliver Twist" and "Nicholas Nickleby" were penned here, and visitors can examine photographs and other items left by the renowned author. Much of the house has been restored to its original appearance. TUBE: Chancery Lane