
The running of the bulls (Spain): Every July, more than 1,000 runners participate in Pamplona's annual bull run -- when revelers try to outrun the charging bulls through the streets in the city's old quarter.

The Iditarod sled dog race (USA): The great race across Alaska lasts for at least eight days, covers more than 1,000 miles and takes place in temperatures as low as -50C (-58F).

Chernobyl (Ukraine): The Chernobyl nuclear power plant, as well as