The seven wonders of the world are some of the most visited sites on the planet, and with good cause.

Back in 2007 there was a campaign to update this exclusive list to promote more sites of historical and cultural importance by selecting seven new wonders of the world.

This year the public are being asked to vote again, this time on seven wonders of nature worth visiting.

Amandeep Bhangu reports from the Iguazu Falls on the border of Argentina and Brazil to see why it has been shortlisted.

Visit New Wonders of Nature to see all 28 finalists.

Get in touch with Fast Track via e-mailorFacebook.

Watch Fast Track on the BBC World News channel on Saturdays at 0330, 1330 and 1830 GMT or Sundays at 0630 GMT.