Grand Canyon at twilight.

© RicardMN Photography

© RicardMN Photography

Grand Canyon at twilight.

Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona.
The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,000 feet / 1,800 metres) Nearly two billion years of the Earth’s geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While the specific geologic processes and timing that formed the Grand Canyon are the subject of debate by geologists, recent evidence suggests the Colorado River established its course through the canyon at least 17 million years ago. Since that time, the Colorado River continued to erode and form the canyon to its present-day configuration.

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Golden Gate Bridge Looking South

© RicardMN Photography

© RicardMN Photography

The Golden Gate Bridge is a suspension bridge spanning the Golden Gate strait, the mile-wide, three-mile-long channel between San Francisco Bay and the Pacific Ocean. The structure links the U.S. city of San Francisco, on the northern tip of the San Francisco Peninsula, to Marin County, bridging both U.S. Route 101 and California State Route 1 across the strait. The bridge is one of the most internationally recognized symbols of San Francisco, California, and the United States. It has been declared one of the Wonders of the Modern World by the American Society of Civil Engineers.

The Frommers travel guide considers the Golden Gate Bridge “possibly the most beautiful, certainly the most photographed, bridge in the world”. It opened in 1937 and was, until 1964, the longest suspension bridge main span in the world, at 4,200 feet (1,300 m).

Before the bridge was built, the only practical short route between San Francisco and what is now Marin County was by boat across a section of San Francisco Bay. Ferry service began as early as 1820, with regularly scheduled service beginning in the 1840s for purposes of transporting water to San Francisco.

The weight of the roadway is hung from two cables that pass through the two main towers and are fixed in concrete at each end. Each cable is made of 27,572 strands of wire. There are 80,000 miles (130,000 km) of wire in the main cables. The bridge has approximately 1,200,000 total rivets.

As a prominent American landmark, the Golden Gate Bridge has been used in numerous media which includes books, films and video games.

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Trinity Waterfall In Monasterio De Piedra Park

© RicardMN Photography

© RicardMN Photography

Monasterio de Piedra (Piedra Monastery) is a monastery, hotel and park complex in the Iberian System mountain ranges, near Nuévalos, province of Zaragoza, Aragon, Spain.

The monastery is located near the Piedra River Canyon, home to many species of birds, damselflies, trout, and endangered fish like the South-west European nase and an endangered species of barbel. The canyon itself includes a network of mossy, garden-like caves (natural and man-made), waterfalls and lagoons that contrast with the otherwise dry hills of southern Aragon.

The dissolution and precipitation of local limestone has created numerous rivulets, springs, and Karst topography. The Piedra River meanders around a mountain known as “El Espolón” (The Ram). In 1959, a dam was constructed across the river which created the 1300 acre La Tranquera Reservoir, flooding part of the canyon, some of the best local farmland, and several villages. The roofs of some drowned houses can still be seen when the water levels are down. The reservoir provides a domestic water supply, irrigation and electrical energy. (Description from Wikipedia)

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