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Eric Guinther, User:Marshman · CC BY-SA 3.0
Landmark Americas wonder World Heritage

Carlsbad Caverns

3000 BCE – still standing

Vast limestone cave system in New Mexico featuring the Big Room, one of the largest underground chambers in North America

Wikipedia

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

Carlsbad Caverns National Park on Wikipedia.

Elsewhere in Americas 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 credits5 pictures from Wikimedia Commons