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A Delaware-sized museum of sedimentary erosion that walks you down through a 200-million-year-old staircase of animals (that’s us!), minerals and vegetables— a.k.a the longest, slowest front porch ever.

Depending on where you stand, Grand Staircase–Escalante National Monument has been quietly doing its thing for between 275 million and 50 million years. But it’s relatively new to us humans: It was the last part of the lower 48 United States to get cartographed, and once people started poking around they realized they were dealing with an un-spent wealth of ancient and modern science and culture. President Bill Clinton set it aside as a national monument in 1996 because its untrammeled significance distinguishes it for researchers and explorers alike. So don’t trammel it.