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Hamilton Pool Preserve is a natural pool that was created when the dome of an underground river collapsed due to massive erosion thousands of years ago. The pool is located about 23 miles (37 km) west of Austin, Texas off Highway 71. Since the 1960s, Hamilton Pool has been a favorite summer swimming spot for Austin visitors and residents. Hamilton Pool Preserve consists of 232 acres (0.94 km2) of protected natural habitat featuring a jade green pool into which a 50-foot (15 m) waterfall flows...

Goldfield, Nevada, used to be a mining town with many gold mines. By 1904 there lived 30,000 citizens and it was the largest city in Nevada. The local Tex Rickard’s Northern Saloon had a bar so long it required 80 bartenders to run it. In 1920s gold began to run out. In 1923 a fire destroyed most of the town's wooden buildings. Today about 400 people still live in Goldfield, but town became a ghost town...

The illegal drug trade is a global black market, dedicated to cultivation, manufacture, distribution and sale of those substances which are subject to drug prohibition laws. Most jurisdictions prohibit trade, except under license, of many types of drugs by drug prohibition laws. A UN report said the global drug trade generated an estimated US$321.6 billion in 2003. With a world GDP of US$36 trillion in the same year, the illegal drug trade may be estimated as slightly less than 1% (0...

National Geographic, formerly the National Geographic Magazine, is the official journal of the National Geographic Society. It published its first issue in 1888, just nine months after the Society itself was founded. It is immediately identifiable by the characteristic yellow frame that surrounds its front cover. There are 12 monthly issues of the National Geographic per year, plus additional map supplements. On rare occasions, special editions are issued...

During the 17th century, a series of moats and fortresses were built over the West Brabant Water Line region of the Netherlands to provide protection from invasion by France and Spain. Fort de Roovere was surrounded by a shallow, muddy moat that was too deep to march across and too shallow for boats. Recently the fort was opened for tourist but instead of building an overbridged over the moat which would have definitely taken away the fort’s dramatic view, a sunken bridge was designed...