See how Trier Germany changed between the 1940s and 2025. Drag the slider to compare the historic photograph with the modern view.
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Constructed around 170 AD, the Porta Nigra in Trier, Germany, is the largest Roman city gate north of the Alps. Built from approximately 7,200 sandstone blocks without mortar, it was originally part of a system of four gates protecting the Roman city of Augusta Treverorum. The gate's name, meaning "black gate," originated in the Middle Ages due to the darkened colour of its stone; the original Roman name has not been preserved. (en.wikipedia.org) In the 11th century, the Greek monk Simeon lived as a hermit within the structure, and after his death in 1035, it was converted into a double church, which inadvertently preserved it from demolition. (worldhistory.org) Napoleon Bonaparte ordered its restoration to its Roman form in 1804, removing the medieval additions. (en.wikipedia.org) Today, the Porta Nigra stands as a testament to Roman engineering and history, attracting visitors from around the world.
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