Making 10 wonders of the world — in ghostly color

6.) 1920 – Excavation and renovation of the Stone Henge monument

1920 - Excavation and renovation of the Stone Henge monument
1920 - Excavation and renovation of the Stone Henge monument - 1

8.) 1932 – Inspecting work on the face of Washington, Mt. Rushmore, South Dakota

1932 - Inspecting work on the face of Washington, Mt. Rushmore, South Dakota - 1
1932 - Inspecting work on the face of Washington, Mt. Rushmore, South Dakota

9.) 1934 – The Golden Gate Bridge under construction, San Francisco, California

1934 - The Golden Gate Bridge under construction, San Francisco, California - 1
1934 - The Golden Gate Bridge under construction, San Francisco, California

10.) 1935 – Officials in a pipe by the soon to be completed Hoover Dam, Arizona

1935 - Officials in a pipe by the soon to be completed Hoover Dam, Arizona - 1
1935 - Officials in a pipe by the soon to be completed Hoover Dam, Arizona

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