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The Lost Index

A medieval dormitory, as depicted in 1450 (Credit: Getty Images)
The Lost Index

The lost ancient practice of communal sleep

By Zaria Gorvett

A mosaic of the Byzantine empress Theodora from 547AD (Credit: Alamy)
The Lost Index

The ancient colour no one can make

By Zaria Gorvett
The last page of a First Folio by William Shakespeare (Credit: Getty Images)
The Lost Index

The Shakespeare play lost since 1603

By Zaria Gorvett
A drawing of knights fighing from the Gladiatoria group of fight books (Credit: Alamy)
The Lost Index

The mystery of how knights fought

By Zaria Gorvett
Once the missing Palomares weapon had been recovered, a bomb disposal team had to find a way to deactivate it (Credit: Getty Images)
The Lost Index

The nuclear weapons no one can find

By Zaria Gorvett
A vial of dried smallpox vaccination containing around 100 doses (Credit: Getty Images)
The Lost Index

The 83-year hunt for a vanished virus

By Zaria Gorvett
A memorial tombstone of a sleeping knight (Credit: Alamy)
The Lost Index

The forgotten way medieval people slept

By Zaria Gorvett
A ceiling decoration featuring a Talbot dog (Credit: Alamy)
The Lost Index

The bizarre dog breeds time forgot

By Zaria Gorvett
The Grand Canyon shrouded in cloud (Credit: Getty Images)
The Lost Index

The search for the eon that vanished

By Zaria Gorvett
A close up of a thorny Vachellia nilotica plant (Credit: Alamy)
The Lost Index

The search for India's forgotten hedge

By Kamala Thiagarajan
The 1878 Six Days' Race at the Royal Agricultural Hall, Islington (Credit: Alamy)
The Lost Index

The forgotten sporting mania from 1879

By Zaria Gorvett
A drawing of medlar fruits from around 1600 (Credit: Alamy)
The Lost Index

The forgotten fruit with a vulgar name

By Zaria Gorvett
A model wearing a muslin stole from the 19th century (Credit: Drik/ Bengal Muslin)
The Lost Index

The fabric no one knows how to make

By Zaria Gorvett
An artist’s depiction of Planet Nine (Credit: ESA/Hubble, M. Kornmesser)
The Lost Index

The giant planet scientists can't find

By Zaria Gorvett
A view of New Zealand from the sea (Credit: Getty Images)
Best of BBC Future

The lost continent that had to be found

By Zaria Gorvett