Glass Beach in MacKerricher State Park near Fort Bragg, California.  Pretty now but horrendous start, residents treating the ocean as their "Dump"... over time the broken glass has been smoothed out by the pounding waves. #arenophile

Glass Beach in MacKerricher State Park near Fort Bragg, California. Pretty now but horrendous start, residents treating the ocean as their "Dump"... over time the broken glass has been smoothed out by the pounding waves. #arenophile

Inner Space Caverns, Georgetown, Texas - discovered in 1963 when boreholes were drilled to test for a highway overpass on IH-35.  Many prehistoric animal remains were found due to sinkholes that were open to the surface 13,000-25,000 years ago.

Inner Space Caverns, Georgetown, Texas - discovered in 1963 when boreholes were drilled to test for a highway overpass on IH-35. Many prehistoric animal remains were found due to sinkholes that were open to the surface 13,000-25,000 years ago.

The Alamo, San Antonio, Texas  Originally established in 1718, this Spanish mission in San Antonio was the site of a historic battle for Texan independence and remains a spiritual touchstone in the heart of Texans. Look for the Heritage Tree, a mammoth live oak on the grounds. Murat Taner/Corbis

The Alamo, San Antonio, Texas Originally established in 1718, this Spanish mission in San Antonio was the site of a historic battle for Texan independence and remains a spiritual touchstone in the heart of Texans. Look for the Heritage Tree, a mammoth live oak on the grounds. Murat Taner/Corbis

7 maravillas subterraneas del mundo 4

7 maravillas subterraneas del mundo 4

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