Waves forced through lava tubes blast spray 30 metres into the air — locals throw coconuts in to launch them.
Coastline of spouting blowholes.
A 70-metre crater of natural gas that has burned since 1971 — camp beside the "Door to Hell" at night.
Kiribati is the only country in all four hemispheres — stand on the equator on Kiritimati, the first place on Earth to see the new day.
A salt lake turned pink by algae, where salt-gatherers wade waist-deep and the water floats you.
The world's brightest bioluminescent bay.
Plankton light the surf electric blue on Vaadhoo and other islands on dark nights.
The "Eye of the Sahara" from the ground.
Swim at night in a lagoon near Falmouth where bioluminescent plankton light up every stroke.
Drift by boat beneath a cave ceiling lit by thousands of glowworms.
Fly over the Nazca Lines, giant desert figures etched into Peru's coastal plain two thousand years ago
The "river of five colours", turned red by aquatic plants between June and November.
Sandy spit at Denmark’s northern tip where the Skagerrak and Kattegat collide.
The highest tides on Earth, best watched among the Hopewell Rocks flowerpot stacks.
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