Two men prepare a hot air balloon during the 33rd International Hot Air Balloon week, in the skiing resort of Chateau d'Oex, in the Swiss Alps, Switzerland, Jan. 23. Over 80 balloons from 15 countries are participating in the ballooning event in the Swiss mountain resort famous for ideal flight conditions due to an exceptional microclimate.

A hot air balloon taking off during the 33rd International Hot Air Balloon week, in the skiing resort of Chateau d'Oex, in the Swiss Alps, Switzerland, Jan. 23. Over 80 balloons from 15 countries are participating in the ballooning event in the Swiss mountain resort famous for ideal flight conditions due to an exceptional microclimate.