The big party: A mile-long sea of black, red, and gold will stretch from the Brandenburg Gate to the Victory Column when half a million fans fill the Strasse des 17. Juni to watch matches shown on boulevard-wide screens—all 48 of the matches from the second round through the final.
Marquee matchup: If all goes according to plan, look for an elimination-round clash between Germany and the U.S. on June 27 at 4 p.m.
Sing-along: "Auf geht's, Deutschland, schiesst ein Tor, schiesst ein Tor, schiesst ein Tor!" ("Let's go, Germany; goal, goal, goal!")
Sideline tip: For a slightly smaller party, catch first-round action (with bratwurst and pilsners) at Prater Garten, a 173-year-old beer garden with picnic-table seating for 600.
The big party: The largest World Cup viewing party in the U.S. will take place at Boston's City Hall Plaza, a red-brick and concrete square with one huge selling point: room for the 300,000 people anticipated to show up and watch the final at July 11 at 2:30 p.m.
Marquee matchup: Brazil, Italy, Germany, France, and Spain are the most likely contenders to make the final match. Longer shots include the U.S. Go team!
Sing-along: Stick with the universal soccer anthem, "Olé, olé, olé, olé," and you'll be fine regardless of which teams reach the final.
Spirit colors: Boston was painted red, white, and green when Italy won its fourth title in 2006—expect a crowd lopsided in that country's favor if the Azzurri reach the final again.
Sideline tip: The recently renovated Boston Children's Museum gets in on the South African excitement with a two-day festival of African food, music, and dance, June 11 and 12 (308 Congress St., 617/426-6500).
The big party: The Chicago Bears' house welcomes a different brand of football, with 40,000 people expected to watch the July 11 final on the Jumbotron at Soldier Field. Admission is $20.
Marquee matchup: If the U.S. or Mexico makes the final, expect a sellout crowd closer to the stadium's 63,000-person capacity.
Sing-along: American soccer fans are still looking for their own fight song. In the meantime, chants of "U-S-A, U-S-A!" are sure to fill the air if our team reaches the championship.
Sideline tip: During the rest of game day at Soldier Field, walk around the World Cup Festival, with South African movie screenings and a French Bastille Day feast. On May 10, a couple of months before the key day, catch an early look at the Mexican team in a Soldier Field exhibition match against Senegal.
The big party: Up to 100,000 fans will fill the Plaza de la Constitución, a square framed by the National Palace—the baroque building that serves as the seat of the federal government—and the gorgeous Metropolitan Cathedral, to watch Mexico's matches on huge outdoor screens.
Marquee matchup: Mexico is the favorite as it takes on host country South Africa in the tournament's opening game, June 11 at 9 a.m.
Sing-along: "Cielito Lindo" ("Pretty Sweetheart"), a traditional song adopted as an anthem for the soccer team: "Ay, ay, ay, ay, canta y no llores" ("Ay, ay, ay, ay, sing and don't cry").
Sideline tip: Because of the time difference, games start as early as 6 a.m. in Mexico—a headache that can be treated with a café con leche and sweet pastries from nearby Café de Tacuba. Or a cerveza from Salón Corona ($2) if you want to start the party early.
The big party: In the shadow of the Eiffel Tower, 15,000 fans will pile into the grassy mall known as the Trocadéro every match day, watching giant TVs and hoping to cheer the Blues to a third consecutive final.
Marquee matchup: If France breezes through the early rounds as expected, look for a quarterfinal showdown with another title contender, England, on July 2 at 8:30 p.m.
Sing-along: There's no signature song, but there's plenty of screaming of "Allez les Bleus!" ("Go Blues!").
Sideline tip: Just two days after the final match, the celebration will likely move down the Seine River to Place de la Bastille for an annual dance party that promises to be especially festive if the French squad wins a championship.
RIO DE JANEIRO
The big party: If celebrating were a competitive sport, five-time World Cup champ Brazil would be unbeatable. Case in point: 32 straight days of 20,000-person Copacabana Beach parties, starting with a pre-Cup concert June 10 and including live beach broadcasts of all 64 matches.
Marquee matchup: Clash of the titans against sixth-ranked Portugal, June 25 at 11 a.m.
Sing-along: "A Taça do Mundo é nossa! Com Brasileiro, não há quem possa!" ("The World Cup is ours! No one can handle Brazilians!").
Sideline tip: Drop by Estádio do Maracanã, one of the world's largest stadiums and site of the 2014 World Cup. Even if the stadium is closed to tours because of renovations, you can stand in the pavement footprints of soccer greats Pelé and Ronaldo at the accompanying museum (Rua Professor Eurico Rabelo, 011-55/21-2234-1705, $11).
The big party: There's only a footprint left of the Circus Maximus stadium where ancient Romans gathered to watch chariot races, but it's a large footprint. About 700,000 fans packed into this standing-room-only grassy knoll (and the nearby streets) to watch Italy's team hoist the 2006 World Cup trophy. Feeling bullish about a repeat, Rome will invite fans to watch every 2010 match here. Even Caesar would have been impressed by the anticipated crowds.
Marquee matchup: Italy vs. up-and-coming power Paraguay, June 14 at 8:30 p.m.
Sing-along: No one is quite sure why Italian fans took to chanting to the tune of the White Stripes' "Seven Nation Army" during the team's 2006 title run, but they liked the result and have stuck with the song ("I'm gonna fight 'em off/A seven-nation army couldn't hold me back"). Fans sing along to the pounding guitar riff: "Po-po-po-po-po-PO-ooh."
Sideline tip: The viewing parties are just one part of this year's Estate Romana (Roman summer), a four-month festival of open-air movies, concerts, and sporting events in classic settings like the ancient stone amphitheater at the port of Ostia Antica, including the Golden Gala, a track-and-field event that brings world-class athletes to Stadio Olimpico on June 10 (estateromana.comune.roma.it).
The big party: Australia's enthusiasm for its boys in green and gold will be on full display in Darling Harbour, where two floating Jumbotrons are set to screen every game for the total of 30,000 fans watching for free from adjacent Cockle Bay Wharf and Tumbalong Park. Expect fireworks by the Harbour Bridge if the Australian heroes triumph.
Marquee matchup: Australia vs. three-time champ Germany, June 14 at 4:30 a.m.
Sing-along: "Waltzing Matilda," a nationalistic ballad about a noble sheep thief, is the raucous anthem belted out during games. Crowds will sing lines about the itinerant worker (called a swagman) who dove into a small lake (a billabong) to escape capture: "Up jumped the swagman and sprang into the billabong, 'You'll never take me alive,' said he."
Sideline tip: Stay awake before the late-night (and early-morning) matches with lively experimental music, film and theater events at the Vivid Sydney festival, held at the Sydney Opera House and various other locations May 27 through June 21.
The big party: Up to 37,000 fans, many clad in all-blue outfits topped with red-sun headbands, will head to the Saitama Super Arena to watch their Samurai Blue play first-round matches on the big screens, while the national team mascot, a blue-shirted, soccer-playing bird, leads the cheers.
Marquee matchup: Japan vs. Netherlands, June 19 at 8:30 p.m., for the home country's likely do or die.
Sing-along: Japanese fans are considerate enough to craft chants opponents will understand, as in "Vamos Nippon!" That one just means: "Let's go, Japan!"
Sideline tip: Like in the U.S. (but almost nowhere else in the world), baseball is more popular here than soccer is, so even more intense fans are on tap at the Tokyo Dome during Yomiuri Giants games (1-31-61 Koraku, no phone orders, tickets from $11).