Museums and galleries.

In the U.S., there's a museum for practically everything. From toys to priceless artifacts, from entertainment legends to dinosaur bones—nearly every city in the country has a museum worth visiting.

The highest concentrations of these museums are found in the largest cities, of course, but none compare to Washington, D.C., home to the Smithsonian Institution. With almost twenty independent museums, most of them located on the National Mall, the Smithsonian is the foremost curator of American history and achievement. The most popular of the Smithsonian museums are the National Air and Space Museum, the National Museum of American History, and the National Museum of Natural History, but any of the Smithsonian museums would be a great way to spend an afternoon—and they're all 100% free.

New York City also has an outstanding array of world-class museums, including the Guggenheim Museum, theAmerican Museum of Natural History,the Museum of Modern Art (MOMA), the Metropolitan Museum of Art, the Intrepid Sea-Air-Space Museum, and the Ellis Island Immigration Museum.

You could spend weeks exploring the cultural institutions just in D.C. and the Big Apple, but here's a small fraction of the other great museums you'd be missing:

§ Carnegie Museums of Pittsburgh — Pittsburgh

§ Children's Museum of Indianapolis — Indianapolis, Indiana

§ Exploratorium — San Francisco

§ Hollywood Walk of Fame — Los Angeles

§ Monterey Bay Aquarium — Monterey, California

§ Museum of Science & Industry — Chicago

§ Naismith Memorial Basketball Hall of Fame — Springfield, Massachusetts

§ National Aquarium in Baltimore — Baltimore, Maryland

§ National Baseball Hall of Fame and Museum — Cooperstown, New York

§ Pro Football Hall of Fame — Canton, Ohio

§ Rock and Roll Hall of Fame and Museum — Cleveland, Ohio

§ San Diego Zoo — San Diego, California

§ Strong National Museum of Play — Rochester, New York

§ Music — Mid-size to large cities often draw big ticket concerts, especially in large outdoor amphitheaters. Small towns sometimes host concerts in parks with local or older bands. Other options include music festivals such has San Diego's Street Scene or South by Southwest in Austin. Classical music concerts are held year round and performed by semi-professional and professional symphonies. Boston, for instance, occasionally puts on free concerts in the Public Park. Many cities and regions have unique sounds. Nashville is known as Music City because of the large number of country artists that live in the city. It's home to the Grand Ole Opry, one of the most famous music venues in the country. Country music is popular throughout the U.S. but is particularly concentrated in the South and rural West. Seattle is the home of grunge rock. Many of the most popular bands are based out of Los Angeles due to the large entertainment presence and concentration of record companies.

§ Marching Band — In addition to traditional music concerts, a quintessential American experience is the marching band festival. One can find these events almost every weekend between September and Thanksgiving throughout the country and again from March to June in California. Check local event listings and papers to find specifics. Also notable is the Bands of America Grand National Championship held every autumn in Indianapolis. Those looking to see the best of the best should acquire tickets to the "finals" performance, where the ten best bands of the festival compete for the championship. This event is now held at the Lucas Oil Stadium. Both "street" or parade marching bands as well as "field" or show bands are found at almost every high school and university in America.

§ Professional sports — The United States has a professional league for virtually every sport, including pillow fighting. A few of the most popular leagues are:

§ MLB — Major League Baseball is very popular and the sport of baseball is often referred to as "America's pastime" (being one of the most widely played in the country). The league has 30 teams (29 in the U.S. and 1 in Canada). Season lasts from April to September with playoff games held in October. With 30 teams playing 162 games per team per season and the cheapest seats usually $10-20, this is possibly the best sporting event for international travelers to watch.

§ NBA — The National Basketball Association is the world's premier men's basketball league and has 30 teams (29 in the U.S. and one in Canada). Season runs November to April, with playoffs in May-June.

§ NFL — The National Football League, with 32 teams, is the leading promoter of American football in the world, a sport which has virtually nothing in common with the sport that most other countries call football (Americans know that sport as soccer). The day of the championship game, called the Super Bowl, is an unofficial national holiday. Season lasts from September to December, with playoffs in January ending with the Super Bowl in February.

§ NHL — The premier league for ice hockey in the world, featuring 30 teams (23 in the U.S. and 7 in Canada). A slight majority of players are Canadians, but the league has players from many other parts of the world, mainly the United States, the Nordic countries (primarily Sweden and Finland), Russia, the Czech Republic, and Slovakia. Originally in Northern markets, recent expansions have each major region covered with a NHL team. The season runs from October to April, followed by playoffs that culminate in the Stanley Cup Finals in June.

§ INDYCAR — Beginning as the original form of American motorsport in 1911 with the first Indianapolis 500. INDYCAR has since come to be the premier open-wheel racing series in North America. The competition in INDYCAR is known to be closer, faster, and far more dangerous than that of NASCAR. Unlike NASCAR which almost races exclusively on "oval" tracks, INDYCAR competes on a wide variety of tracks ranging from city streets, road courses, to ovals like the world famous Indianapolis Motor Speedway in Speedway, Indiana which plays host to the most famous and prestigious race in the world, the Indianapolis 500, where speeds can reach up to a thrilling 240 miles per hour! INDYCAR holds races all across the United States, as well as Brazil, Canada and as of 2012 China, from March to October.

§ NASCAR — Viewed by many as a "regional sport" confined to the more rural areas of the South, the National Association for Stock Car Auto Racing (NASCAR) has seemingly broken away from those misconceptions over recent years to become a major spectator sport across the country. While a majority of the tracks still reside in the Mid-Atlantic and South, NASCAR holds races all across the country, beginning with their marquee event, the Daytona 500, in mid-February and ending in late November.

§ MLS — Major League Soccer, newly expanded to 19 teams for 2012 (16 in the U.S. and three in Canada), is the latest attempt to kick start American interest in soccer. While it may not be as popular with the media, MLS is still widely viewed and enjoyed. Foreign travelers can find particularly vibrant and familiar fan experiences in several cities, notably Washington, Chicago, Houston, Kansas City, Portland, and Seattle.

§ College sports — One rare feature of the United States sports landscape, as compared to that of other nations, is the extent to which sports are associated with educational institutions. In many regions of the country, local college or university teams, especially in football and men's basketball, enjoy followings that rival or surpass those of major professional teams. The primary governing body for U.S. college sports is the National Collegiate Athletic Association (NCAA), which has over 1,000 member schools, including essentially all of the country's best-known colleges and universities. The college football season runs from roughly September 1 through mid-December, with postseason bowl games running into early January. The basketball regular season begins in mid-November and ends in late February or early March, followed by conference tournaments and then national postseason tournaments that run through early April. The NCAA Division I men's basketball tournament, popularly known as "March Madness" (an NCAA trademark), is especially widely followed even by casual sports fans.

§ Festivals and Fairs — A few days prompt nation-wide celebrations. They include Memorial Day,Independence Day (a.k.a. Fourth of July), and Labor Day. Other major holidays like Thanksgiving Day are marked by private festivities. Many towns and/or counties throw fairs, to commemorate the establishment of a town or the county with rides, games, and other attractions.

§ Memorial Day — commemorates the ultimate sacrifice made by America's war dead. It is not to be confused with Veterans Day (11th November) which commemorates the service of America's military veterans, both living and deceased. It is the also the unofficial start of summer -- expect heavy traffic in popular destinations, especially National Parks and Amusement Parks.

§ Independence Day — Celebrates America's independence from Great Britain. The day is usually marked by parades, festivals, concerts, outdoor cooking and grilling and firework displays. Almost every town puts on some sort of festivity to celebrate the day. Large cities often have multiple events. Washington, D.C. celebrates the day on the Mall with a parade and a fireworks display against the Washington Monument.

§ Labor Day — The U.S. celebrates Labor Day on the first Monday of September, rather than May 1st. Labor Day marks the end of the summer social season. Some places, such as Cincinnati throw parties to celebrate the day.

§ National Parks. There are numerous national parks throughout the United States, especially the vast interior, which offer plenty of opportunities to enjoy your favorite outdoor activities, including Recreational shooting, ATV riding, hiking, bird watching, prospecting, and horseback riding. In more urban areas, some national parks are centered around historic landmarks.

§ National Trails System is a group of twenty-one 'National Scenic Trails' and 'National Historic Trails' as well as over 1,000 shorter 'National Recreation Trails' for a total length of over 50,000 miles. While all are open to hiking, most are also open to mountain biking, horseback riding, and camping and some are even open for ATVs and cars.