"I would never trade going to the Olympic Games and standing on top of the medal podium or being able to turn professional or travel all over the world, I would never trade any of it in, " he said.

CNN: Phelps dives into Olympic history

AltruHelp at 2012 National Volunteer Conference in ChicagoThe conference is organized annually by the Points of Light Institute and people travel from all over the world to learn, connect and be inspired through a wide range of exciting workshops, service projects, specialized corporate tracks and more!

FORBES: Navigating Social Innovation: Road Trip to the National Conference on Volunteering

Each spring many species of migratory songbirds travel to the Arctic tundra from all over the world to breed.

CNN: Next global warming worry: Thawing tundra

Enthusiasts from all over the world will travel to the island this summer for the chance to drive the restored train - as part of the 'Ultimate Driving Experience' project, which currently has a two-year waiting list.

BBC: Caledonia

Twenty thousand people from all over the world are expected to travel to the gig and of course they will be spending money when they get here.

BBC: Eyes of the world fall on Belfast ahead of MTV EMA's

Extreme adventurists travel to Ouray, Colorado, from all over the world to test their strength, skill and stamina on the vertical walls of ice.

FORBES: Film Maker's Extreme Escape From Hollywood