分类必应美图下的文章

鸟瞰桑吉奈尔群岛，法国科西嘉 (© sam74100/Getty Images Plus)

伊夫城堡，法国马赛 Château d'If in Marseille, France (© Boris Stroujko/Shutterstock)

A prison fit for a count

Château d'If, off the coast of Marseille, France, was built beginning in 1524 as a fortress by King Francis I because of the tiny island's steep cliffs and strategic location. While the 'château' never gained notoriety defending the ancient port (since it was never attacked), it did become famous as a prison. Surrounded by treacherous currents—like Alcatraz in San Francisco—it gained a reputation starting in the late 16th century as a dumping ground for powerful political and religious prisoners. As far as official records go, none of the prisoners condemned there ever escaped.

However, there is one famous tale of an escape from the château by one Edmond Dantes, the titular hero of the 1844 Alexander Dumas novel 'The Count of Monte Cristo.' And though he is a work of fiction, you can visit Edmond Dantes' cell on the lower level of the prison. The nearly perfectly preserved castle is just a short ferry ride from the docks of the old port of Marseille.

死亡谷国家公园跑道湖的迷踪石，加利福尼亚 Sailing stone at Racetrack Playa in Death Valley National Park, California (© Patrick Walsh/Getty Images)

Rocks on the move

No, that stone in today's homepage image didn't get there by itself. Or, did it? Not only is Death Valley one of the hottest places on Earth, it also boasts a mysterious geologic phenomenon—rocks that drift across the exceptionally flat desert floor, seemingly under their own power. The rocks here at Death Valley's Racetrack Playa are known as 'sailing stones' and they can vary in size from a few ounces to hundreds of pounds. As seen in our image, the stones leave long trails behind them as they move across the scenic dry lakebed.

Since the stone trails were first observed in the early 1900s, no one knew just how the stones managed to have apparently 'sailed' across Racetrack Playa without someone to push them along. Because they'd never been seen moving, the sailing stones gave rise to many wild theories to explain their mobility. Then, in 2014, scientists captured the movement of the stones for the first time using time-lapse photography, and the mystery was finally solved: The stones move only with the perfect balance of melting ice, water, and wind. One day that winter of 2014, rain had formed a shallow pond that froze overnight. When it thawed in the next day's sun, the very thin ice sheet melted and cracked into floating panels. Driven by a light wind, these sheets accumulated behind the stones, and very slowly pushed them forward.

奥卡诺根的斑点湖，加拿大不列颠哥伦比亚省 Spotted Lake in the Okanagan region of British Columbia, Canada (© Galyna Andrushko/Shutterstock)

Spotted Lake emerges

This might look like the surface of some distant planet, but Spotted Lake is much closer to home. Just north of the US border in the Okanagan Valley of British Columbia, Canada, the lake's strange coloration is due to its high concentrations of mineral deposits. It's a protected cultural site of the Syilx/Okanagan Nation for its healing properties. Spotted Lake is an endorheic lake, which is a basin where water collects but has no river or sea to drain into. The water level rises with rainfall during autumn and winter and then as the days grow longer and hotter the water lowers as it evaporates. During the hot, dry summers in the Okanagan, Spotted Lake earns its name–large 'spots' in varying hues of blue, green, or yellow become more prominent as the water level drops. The area's closed to the public, but you can get a decent view from the highway. Binoculars recommended.

The Giant's Causeway, Bushmills, Northern Ireland, UK (© Chiara Salvadori/Getty Images)

In the footsteps of giants.

Let's follow in the footsteps of giants, this is one of the most popular tourist attractions in Northern Ireland. The Giant's Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic fissure eruption. It was declared a World Heritage Site by UNESCO in 1986 and a national nature reserve in 1987 by the Department of the Environment for Northern Ireland. The tops of the columns form stepping stones that lead from the cliff foot and disappear under the sea. Most of the columns are hexagonal, although there are also some with four, five, seven, or eight sides. The tallest are about 12 meters (39 ft) high, and the solidified lava in the cliffs is 28 meters (92 ft) thick in places.

马卡雷纳山脉中的卡诺克里斯塔尔斯河，哥伦比亚 The Caño Cristales river in the Serranía de la Macarena mountains of Colombia (© Jorge Iván Vásquez Cuartas/Getty Images)

Go with the rainbow flow

Today's photo brings us to the banks of Caño Cristales, the 'liquid rainbow' that cuts a prismatic path through the heart of Colombia. From June through November, when the clear water is low, the abundant underwater plants that cover the riverbed show off their red, yellow, green, and blue hues. The star of the show—especially in this photo—is Macarenia clavigera, a riverweed that ranges from bright red to deep crimson or purple depending on its intake of sun rays. In August and September, when the florid flora are at their peak, it's a coveted nature excursion: Because the river's ecosystem is so fragile, visits are limited to guided tours.

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格里姆瑟尔山口Totesee山地湖中倒映出的星星，瑞士伯尔尼 Stars reflecting in Totensee, a mountain lake at Grimsel Pass, Kanton Bern, Switzerland (© magodevita/Getty Images)

Reflections of the night sky

We're featuring this video of the whirling Milky Way over the Totensee, a small natural lake in Switzerland, to remind you that August is a fantastic time for stargazing. In the Northern Hemisphere, the nights are still long and remain warm, so if you're lucky you can catch the always thrilling sight of a falling star. Tonight would be a good night to look for one because we're at the tail end of the annual Perseid meteor shower. Like most predictable meteor showers, it occurs when the Earth's orbit intersects with the long elliptical path of one of the millions of comets that orbit the Sun. It is called the Perseid meteor shower because the bulk of the meteors will appear to originate out of the constellation Perseus. So, turn out the lights, head outside, and look up!

A monster view in Scotland

People love a good mystery. Maybe that's why we've been fascinated by mythical creatures like the Loch Ness monster for nearly 1,500 years. We're looking at Urquhart Castle, a ruin founded in the 13th century, with Loch Ness behind it. As the legend goes, on August 22, 565, an Irish priest named Columba confronted 'Nessie' and commanded the 'water beast' away. Since then, people have claimed to spot, or even photograph the Loch Ness monster, as well as Bigfoot, the chupacabra, the yeti, and other creatures around the world. This subculture practices cryptozoology—the study of hidden animals. Are any of these beasts real? Probably not, but why spoil the fun?

Up in the Highlands

There's a good chance that occupants of that car you can see in this photo, winding along a remote highway in the Highlands of Iceland, won't encounter any other visitors to this desolate region. Accessible only during the summertime, the Icelandic Highlands is a volcanic desert. Frequent volcanic activity in the area creates a porous topsoil full of chemical compounds that aren't conducive to plant growth. Besides, much of the rainfall is quickly absorbed so plant life only appears alongside glacial rivers. Despite this seemingly unwelcome environment, adventurous travelers come to the Highlands every summer to see firsthand an ecosystem so unearthly that NASA conducted training missions here for some of its Apollo astronauts.

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