Ten million fruit bats darken the sky each November — the world’s largest mammal migration.
The "Eye of the Sahara" from the ground.
Plankton light the surf electric blue on Vaadhoo and other islands on dark nights.
Swim at night in a lagoon near Falmouth where bioluminescent plankton light up every stroke.
A calving glacier front you watch from a lodge deck — house-sized blocks crashing into the fjord every few minutes.
A million wildebeest and zebra on the move — Africa’s greatest spectacle.
Hike to Millpu, a staircase of a hundred turquoise travertine pools hidden in an Ayacucho gorge
Drift by boat beneath a cave ceiling lit by thousands of glowworms.
Sandy spit at Denmark’s northern tip where the Skagerrak and Kattegat collide.
The "river of five colours", turned red by aquatic plants between June and November.
The highest tides on Earth, best watched among the Hopewell Rocks flowerpot stacks.
Infobox
