Today, it is the easiest way to use a rich foreign language that lets you make international friends, travel and possibly even stay for free ("pasporta servo").

• You can talk with and/or meet interesting people from all over the world, with conferences, literature, music, education, travel, etc.
• There are between 200 000 and 2 000 000 speakers worldwide.
• It is consistent and sensible.
• Pasporta Servo: "Passport Service" -- list of people who allow free overnight stays for those who will only speak Esperanto with them.
  

  "(From Luke about it:  I cannot guarantee anything there.  It is between you and them, but sounds nice and has been operating for some time.)"

• About "Esperanto": the "invented" but ~"complete", easy-to-learn language to travel & meet people today. Best 2nd language for everyone to communicate, etc.