What we build to hide or protect often outlasts what we build to display.
Chapter 1

Hidden places beneath our feet

Chapter 2

Unbreakable codes and locked books

Chapter 3

Forbidden knowledge and lost sciences

Chapter 4

Secret networks and coded societies

Ch 1 · Hidden places beneath our feet
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007skaty The abandoned City Hall subway station in New York City

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007skaty The Hall of Records

Behind the face, / a hidden space, / where porcelain panels are locked away!

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What we build to hide or protect often outlasts what we build to display.

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007skaty Mount Rushmore houses a hidden chamber called the Hall of Records

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The hidden chambers of the Giza Pyramids

007skaty The ScanPyramids project used muon tomography to locate an inaccessible chamber sealed directly above the Grand Gallery.

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The underground labyrinth of Derinkuyu

007skaty Derinkuyu's massive underground labyrinth featured ventilation shafts, schools, and heavy stone defensive doors.

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The secret subway station of New York
BETA

007skaty Trace the forgotten tracks to discover why New York's secret subway station was abandoned.

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Fun Fact

Hidden cities: Derinkuyu in Turkey had underground schools, stables, and churches that could support twenty thousand people.

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Glossary
catacomb (noun)
An underground cemetery consisting of tunnels and chambers with recesses dug out for graves. In 1898, Arthur Conan Doyle wrote about a fatal archaeological rivalry inside a newly discovered Roman tomb.

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Gossip

Which secret place would you explore first?

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Quiz

Which subatomic particles did scientists track to discover the hidden void in the Great Pyramid of Giza?

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007skaty Derinkuyu is a massive ancient underground city in Turkey.

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Quiz

In what year did the ScanPyramids project announce the discovery of the 'Great Void' inside the Great Pyramid?

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Quiz

In which country was the massive underground city of Derinkuyu discovered behind a basement wall in 1963?

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Quiz

Approximately how many people could the ancient underground city of Derinkuyu accommodate at its peak?

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Quiz

In which year did the elegant City Hall subway station first open to New York commuters?

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Quiz

Why was the beautiful, abandoned City Hall subway station in New York closed to the public in 1945?

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Quiz

Behind which president's face on Mount Rushmore is the secret Hall of Records located?

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Quiz

In what year was the titanium vault containing ceramic historical records finally placed inside Mount Rushmore?

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