The world is filled with amazing natural phenomena that are certainly worth visiting when possible. Here is a look at ten of the most amazing to add to your list of ?must see? natural attractions.

1. Moving Rocks ? California

The Moving Rocks, which are located at the Racetrack Playa in Death Valley, have perplexed researchers for years. When you visit the area, you will notice that there are trails leading to many of the pebbles and boulders in the area. Scientists believe the movement is caused by a combination of water and changes in temperature that make it possible for the wind to actually blow the large rocks.

2. Black Sun ? Denmark

The Black Sun can be witnessed during the springtime in Denmark. It occurs about a half hour prior to sunset and occurs when over one million European starlings block out the sun as they migrate from the south.

3. Rain of Fishes ? Honduras

Every year, sometime between May and July, a dark cloud fills the sky. This is then followed by thunder, lightning and strong wings. After heavy rain falls for 2 to 3 hours, hundreds of living fish can be found coating the ground.

4. Catatumbo Lightning ? Venezuela

Over marshlands in Venezuela, a seemingly never ending storm takes place 140 to 160 nights out of the year. The storm lasts 10 hours each night and experiences up to 280 lightning strikes per hour. To make it even more interesting, the flashes of lightning run from cloud to cloud and result in an arc that is over five kilometers high. In all, approximately 1,176,000 electrical discharges take place there each year.

5. Climbing Goats ? Morocco

A strange site can be seen when visiting Morocco ? literally dozens of goats perched up in trees. The goats are generally found in the Argan tree, as they enjoy eating the fruit from the tree. Farmers also follow these goats in order to collect the argan seeds after the goats spit them out or excrete them. The seeds are then ground up to make oil, which is used in cosmetics and in cooking.

6. Cave of Crystals ? Mexico

The Cave of Crystals is located in a mine in Chihuahua Mexico, which is where the largest known crystals can be found. Most of the crystals are made mostly from Gypsum.

7. Fire Rainbow ? Idaho

The Fire Rainbow, which is more scientifically known as a circumhorizon arc, only appears when the sun is more than 58 degrees above the horizon. As light passes through the cirrus clouds and leaves through the bottom faces of the hexagonal plate crystals in the clouds, the light is refracted and separated. If everything aligns properly, the result is a magnificent rainbow-like formation in the sky.

8. Stone Forest ? China

The Stone Forest consists of a number of large stones made from limestone, each of which was formed when water percolated the surface of the ground and caused erosion to occur. As a result, large stone pillars were formed.

9. Eye of the Sahara ? Mauritania

The Eye of the Sahara is a magnificent landform located in the southwestern area of the Sahara desert. Geologists originally thought the formation was crated when a meteorite hit the earth, but now believe it was caused by erosion. Still, the massive 30 mile diameter and the fact that it has a circular shape makes the formation quite a mystery.

10. The Curtain of Fire ? Hawaii

The Curtain of Fire, which is located on Mount Kilauea?s Eastern Rift, is a wall of magma that measures 100 to 160 feet high.

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