The London Tunnels are a mile-long series of underground tunnels built as a deep-level air raid shelter. They’re set to open ...

An underground tunnel network long rumored thanks to drawings by Leonardo da Vinci under Milan’s Sforza Castle are proven to exist. Ground-penetrating radar and laser scanning revealed that the ...

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Sydneysiders and visitors will get to explore these underground tunnels thanks to a mammoth $1-million restoration project.

Former Fond du Lac Mayor Isaac Brown built the Octagon House in 1856, and it almost didn't survive the 1970s. Here's the history of the house.

Located in the 'Empty Diagonal' with no high-speed rail route in, the volcanic stone city has a fascinating story ...

The term “iceberg home” describes houses with elaborate lower levels like the Kansas City home of Chiefs player Travis Kelce.

The hidden passage, dug 12 meters below ground, was discovered during a dramatic raid on a warehouse in Ceuta’s industrial ...

A sprawling network of secret underground tunnels is being transformed into a major new London tourist attraction. Hidden 40m below the streets of the capital, the Kingsway Exchange Tunnels were ...