1 / 4   Colorful hot air balloons filled the northern Austrian sky early on Monday morning near Gross-Siegharts, Austria. /VCG Photo

2 / 4   Competitors will showcase their flying speed and navigational precision during the 23rd FAI World Hot Air Balloon Championship 2018. /VCG Photo

3 / 4   Around 100 teams from more than 38 countries are taking part in the biennial event. /VCG Photo

4 / 4   Each flight is scheduled for morning or night when light winds usually allow for safer takeoffs and landings. /VCG Photo