Many of the earth's most stunning natural wonders are hidden from view. Here, we take a look at 20 secluded—but spectacular—waterfalls and natural pools around the world. Some of these spots require visitors to go off the beaten path, but the scenic rewards are worth the effort.

Iceland may be known for its , but it is also a country dotted with stunning waterfalls. Gullfoss is perhaps its most known waterfall, and one of the country's most visited attractions, but it's also hidden from view, so that it just appears that a mighty river disappears into the earth. A closer look, however, will reveal the wonder's impressive cascade.

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However, another waterfall in Iceland is more secretive.Gljúfrafoss (or Gljúfrabúi) is a smaller waterfall, partially obscured by the cliff rock. Visitors and sightseers need to follow a winding trail and climb a wooden ladder roughly halfway up to view the falls.

Swimming holes are the world's natural water parks, and in the summer, provide a perfect spot for cooling off. Many of the swimming holes featured in the slideshow above are fed by waterfalls, providing a one-two punch in natural beauty.

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Hawaii's Ohe'o Gulch (also known as Seven Sacred Pools), part of the Haleakala National Park in Maui,is composed of cascading waterfalls and plunge pools in an absolutely breathtaking setting.Some of the pools are more secluded than others and require a hike amidst stunning scenery, but visitors who make the effort are rewarded with their own private postcard-perfect paradise.

Looking to swim in the in the world? Head to To Sua Ocean Trench in Lotofaga village in Samoa. To Sua (which means "big swimming home") is known for its clear, turquoise waters and is almost hidden from view by surrounding lush gardens. A ladder has been installed for visitors and swimmers to climb the 98 feet down to the hole, which travelers say is one of the most beautiful swimming spots in the world.

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