A view of Alcatraz Island in San Francisco Bay. Before it was a federal prison, the island was home to a 19th-century fort, remains of which are still found under newer buildings. (Hans Blossey/Alamy ...
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The world's most active volcanoes: everything you need to know
The highest active volcano in Europe, Mount Etna (pictured above) is a magnificent landmark on the Italian island of Sicily.
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