The ice caves of Iceland’s Vatnajökull Glacier are famous for their striking blue ice. What causes the ice inside these caves to appear blue?
Which European country is home to the Blue Lagoon, the famous geothermal spa known for its milky blue waters?
What is the famous underwater sinkhole located off the coast of Belize called?
Santorini, famous for its blue-domed churches, sits in which sea?
Your score is
0%
