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Ivan Ivankovic from Dubrovnik, Croatia · CC BY 2.0
Landmark Europe wonder

Postojna Cave

3000 BCE – still standing

Largest karst cave system open to visitors in Europe, home to the endemic blind cave salamander (olm)

Wikipedia

The opening of the article, and a way into the rest of it without leaving the site.

Postojna Cave on Wikipedia.

Elsewhere in Europe at the time

Records whose own span overlaps this one, found by the same test the canvas draws with. The bar under each card is where it sits inside this one.

See the whole view
Image credits8 pictures from Wikimedia Commons