8 most amazing natural phenomena on earth

Not only do borders define us, but they also determine who we are. Simple lines on the ground, either man-made or geological, distinguish one culture from the next.

Mysterious spherical stones ranging in size from a few millimeters to several meters have been discovered in Crimea, United States, Russia, and New Zealand. There are many theories from various geologists, but none of them are clear.

At 10,582 square kilometers (4,086 sq mi), the Salar de Uyuni (or Salar de Tunupa) is the largest salt flat in the world. It is located in the Potosi and Oruro departments in southwest Bolivia, near the crest of the Andes, and is elevated 3,656 meters (11,995 ft) above the mean sea level.

In the 1830s, Sweden planted 300,000 oak trees for the purpose of building naval ships. However, by the time the trees matured, metal warships had replaced the need for wooden ones. The forest still stands to this day.

For over a century, Canada’s second-largest power company has been disguising its electrical substations in Toronto as beautiful houses that blend perfectly with the neighborhood. These fake houses contain transformers that supply electricity throughout the city.

There is a place in Austria called Grüner See which is a dry park in winter and turns into a 12-meter-deep lake in summer.

Learn the stories behind seven of the world's most renowned abandoned cities and villages, from the infamous Chernobyl nuclear catastrophe zone to Hashima Island.

Although global warming is a serious threat to the entire planet, some geographical regions are more vulnerable to its effects.

In 1859, wealthy settler Thomas Austin released 13 wild rabbits on his Australian estate. By 1920, their population grew to 10 billion.

Uruguay’s Laguna Garzon Bridge splits into a circle so drivers can slow down and enjoy the view. It also prevents head-on collisions and creates a walkway for pedestrians.

The “Grana Double Tree” in Piedmont, Italy is a highly unusual tree, which consists of a cherry tree growing atop a mulberry tree. It is essentially a two-species, two-tiered hybrid duplex.

Lake Taal, on the island of Luzon, in the Philippines archipelago's northernmost reaches, is unique. It's now one of just two lakes in the world with a third-order island within it, with the lake itself being a part of the order. In other words, Lake Taal, which is located on the island of Luzon, has a volcano (Volcano Island), a lake (Crater Lake), and its own little island (Vulcan Point).

Portland, Oregon is home to the tiniest park in the world, a two-foot-diameter circle. Mill End Park is the name of this park.

Lake Hillier in Australia maintains a bright pink hue all year round. Although no one knows for sure what causes the unique coloring, experts speculate that it might be the result of high salinity, a pink bacteria called “halobacteria,” and a salt-loving algae species called Dunaliella salina.

In Poland, there is a forest with 400 crooked trees that have a 90-degree bend at the base of their trunks. Despite of numerous possibilities, the real reason and how it evolved remain a mystery.

The remote tomb of Qasr al-Farid, situated in the Saudi Arabian desert, dates back to the 1st Century CE. It was built by the Nabataean people, who also built Petra in Jordan. This site has remained largely undisturbed.

The incredible Black and White Aragvi river in Georgia that do not mix up.

In the Peak District Forest of the Scottish Highlands in the UK, there is a unique tree which is laden with only money. This tree laden with money has been studded with British coins for 1700 years, there is no corner of its trunk where a British coin is not stuck.

For many years, people have been attracted to these spectacular-looking boulders because of their shape, components, location, or picturesque surroundings. Many of them are massive, and seeing them is an amazing experience.

Some people believe that there is nothing unexplored remaining on earth but the world doesn't cease to surprise us with its mysteries. Today I'll tell you about the lost places of the planet and animals that live only there.

The dissemination of spores of microalgae has been identified as the origin of the 'Blood Rain' phenomena, according to a new study by Indian and Austrian experts. Since 1896, reports of intermittent red-colored rain in portions of Kerala and Sri Lanka have been coming in. The most recent one occurred in 2013 over Kerala.

Scientists have been puzzled by the Al Naslaa rock formation in Saudi Arabia for a long time, and there is still no explanation for why this boulder appears to have a precise incision across the middle of it.

While we're all locked at home, there's no better way to escape to another time and place than to learn about amazing archeological sites and discoveries from around the world. Here are the 10 greatest and shocking archaeological discoveries —and don't be shocked if they inspire future trip plans whenever it's safe to do so again.

Japan keeps a defunc train station operational in 2015 for the sole purpose of allowing one girl to go to school every day. Only two stops are made by the train: once when an only one high school student departs for school and once when she returns.

The unbelievable "Hanging Stone" of Siberia weighs around 300 tons and has been hanging off a 1,000-meter cliff since the Ice Age.