Now Playing: 4-19-13 Marketplace

With the manhunt going on, the city of Boston was placed on lockdown. It happened quickly and with purpose, but how? We take a look at the mechanics of stopping a city. But, not everyone has stopped. Jonathan Bush and athenahealth kept working, just remotely. In the world of business, Seaworld had a big IPO today, but the real story is on how theme parks are doing so well in a fragile economy.