Though most of the site is protected against development and over-fishing, the climate crisis continues to threaten this delicate ecosystem.
The biggest unbroken intertidal zone in the world, the Wadden Sea runs 300 miles from the Netherlands to Germany and Denmark.
Towering up to 700 feet over the ocean, the Cliffs of Moher run for five miles down the west coast of Ireland.
The eroded walls are a geologic masterpiece, made up of almost 40 distinct, colorful layers of rock including limestone, shale, and sandstone.
The Bay of Fundy's severe tides, which may rise and fall around 50 feet in a day, show finely cut slates offshore in Nova Scotia and New Brunswick.
The striking, vertical peaks in Zhangjiajie, China -- aside from having inspired the floating mountains in the movie "Avatar".
ituated in the middle of a desert, the lake's waters are so saline that nothing but bacteria can survive in them, hence the name.
Spanning over 5,000 feet, the falls drop into a chasm formed by the cliff they descend and another rock face opposite the falls.