These color photographs were taken by Sergei Mikhailovich Prokudin-Gorskii. The images were produced by taking three separate exposures with different colored filters (RGB).
This is time travel. Give each image several seconds of attention and you’ll be rewarded.
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A Group of Workers Harvesting Tea ca. 1907-1915:

Cotton. In Sukhumi Botanical Garden. ca. 1910:

Work at the Bakalskii Mine Pit. ca 1910.

Monks Working Planting Potatoes. Ca 1910:

Three Generations. ca 1910:

A Group of Children. ca. 1909: