Buenos Aires, the sprawling capital of Argentina that sits at the mouth of Rio de la Plata on the South Atlantic Ocean, is a lively city that has it all. Once the wealthiest city in the Americas, it has seen its share of ups and downs, and is now enjoying a renaissance after an economic collapse in 2001. The people, architecture, and food reflect the city's mixture of European and South American roots that have combined to give Buenos Aires a culture all its own. Here's a rundown of the top 10 things to see and do when you go.