1. Old Trafford — Manchester, England
Year Opened: 1910
Capacity: 75,731
Tenants: Manchester United
Why you should visit: It's one of the most popular stadiums in England and they don't call it "The Theatre of Dreams" for nothing.
2. San Siro — Milan, Italy
Year Opened: 1926
Capacity: 80,018
Tenants: A.C. Milan & Inter Milan
Why you should visit: The bitter crosstown rivals share the stadium and have their home games on alternate weekends. If you happen to be there when they play each other, well...you're in for a treat.
3. Olympiastadion — Berlin, Germany
Year Opened: 1936
Capacity: 74,064
Tenants: Hertha BSC
Why you should visit: The historic venue has been home to the Olympics, two World Cups, and multiple rock concerts, and is the second largest stadium in Germany.
4. Estadio Azteca — Mexico City, Mexico
Year Opened: 1966
Capacity: 105,000
Tenants: Club América & the Mexican National Team
Why you should visit: One of the largest and most hostile environments for opposing teams, Azteca has been near impossible for others to win in. It was also where Diego Maradona scored two of his most famous goals ever.
5. Millennium Stadium — Cardiff, Wales
Year Opened: 1999
Capacity: 74,500
Tenants: Wales National Team
Why you should visit: It's the second largest stadium in the world to have a retractable roof, which makes it perfect for not only soccer, but rock concerts, movie filming, motor sports, boxing, and large conferences.
6. La Bombonera — La Boca, Argentina
Year Opened: 1940
Capacity: 49,000
Tenants: Boca Juniors
Why you should visit: The stadium is, by far, one of the fiercest environments for any opposing player and fan. The stadium also features a 90 degree section, which kept the stadium from being built over the street and neighborhood behind it.
7. Allianz Arena — Munich, Germany
Year Opened: 2005
Capacity: 71,437
Tenants: F.C. Bayern Munich, 1860 München, and the German National Team
Why you should visit: The outside design looks like a beautiful boat, along with the inside being near perfect. When Munich takes the field on a Saturday night, it's a great place to be.
8. Estádio do Maracanã — Rio de Janeiro
Year Opened: 1950
Capacity: 78,838
Tenants: Flamengo and Fluminense F.C.
Why you should visit: It's the home of Brazil's national team and is constantly overlooked by the famous Christ the Redeemer statue in Rio. Once inside, the colorful stadium will be sure to impress.
9. Amsterdam ArenA — Amsterdam, Netherlands
Year Opened: 1996
Capacity: 52,960
Tenants: AFC Ajax
Why you should visit: Home to one of the most popular clubs in the Netherlands, the stadium has a huge retractable roof, which has made it a go-to stop for stadium rock shows in Europe.
10. Donbass Arena — Donetsk, Ukraine
Year Opened: 2009
Capacity: 52,518
Tenants: F.C. Shakhtar Donetsk
Why you should visit: It's a unique stadium that can be used daily and includes a fitness center, conference room, restaurant, bar, and café, along with stadium tours and museums.
11. Luzhniki Stadium — Moscow, Russia
Year Opened: 1956
Capacity: 81,000
Tenants: Russian National Team
Why you should visit: It's Russia's largest sporting stadium and future host of the 2018 World Cup. It is also the site of one of Russia's most tragic sporting disasters.
12. Türk Telekom Arena — Istanbul, Turkey
Year Opened: 2011
Capacity: 52,652
Tenants: Galatasaray SK
Why you should visit: Home to one of Turkey's most successful and popular clubs, the stadium once held a world record for the loudest crowd roar in 2011.
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Year Opened: 1957
Capacity: 99,354
Tenants: F.C. Barcelona
Why you should visit: With the likes of Lionel Messi and Neymar taking the field on a weekly basis, you can't go wrong with watching a game in Europe's largest stadium.
14. FNB Stadium — Johannesberg, South Africa
Year Opened: 1989
Capacity: 94,736
Tenants: Kaizer Chiefs F.C
Why you should visit: It's the largest stadium in Africa, host of the 2010 World Cup, and the site of Nelson Mandela's first speech after being released from prison. What more do you need?
15. Anfield — Liverpool, England
Year Opened: 1884
Capacity: 45,276
Tenants: Liverpool F.C.
Why you should visit: To be a part of a stadium full of fans singing "You'll Never Walk Alone" should be on the bucket list for any traveling soccer fan.
16. Providence Park — Portland, Oregon
Year Opened: 1926
Capacity: 20,438
Tenants: Portland Timbers
Why you should visit: Even though soccer isn't immensely popular in the United States, you wouldn't know that after seeing a Timbers home game.
17. Celtic Park — Glasgow, Scotland
Year Opened: 1892
Capacity: 60,832
Tenants: Celtic F.C.
Why you should visit: It's one of the oldest stadiums in the United Kingdom, and if you happen to catch a game in Celtic Park when the Rangers are in town...prepare to have your mind blown.
18. Azadi Stadium — Tehran, Iran
Year Opened: 1973
Capacity: 91,623
Tenants: Esteghlal F.C., Persepolis F.C., and the Iranian National Team
Why you should visit: The stadium once hosted a record 128,000 spectators for a World Cup qualifying game between Iran and Australia in 1998.
19. Estádio Municipal de Braga — Braga, Portugal
Year Opened: 2003
Capacity: 30,286
Tenants: S.C. Braga
Why you should visit: Known as "The Quarry," due to literally being carved out the side of an old quarry, the stadium is one of the most unique in the world.
20. Santiago Bernabéu Stadium — Madrid, Spain
Year Opened: 1947
Capacity: 81,044
Tenants: Real Madrid C.F. & the Spanish National Team
Why you should visit: There's no better place to watch a Champions League game, especially when world superstars and future legends are on the pitch.
21. Wembley Stadium — London, England
Year Opened: 2007
Capacity: 90,000
Tenants: English National Team and the site of the FA Cup Final
Why you should visit: Although New Wembley isn't as historic as the original Wembley Stadium yet, there will be plenty of time to see if England can live up to its glory and bring a World Cup trophy back to the stadium.