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The petroglyphs can be found on volcanic tuff formations formed over 760,000 years ago when a large eruption released hot ash that settled over the region.

The river tracks a diverse landscape from the southern edge of the Rocky Mountains through rugged basalt hillsides, layers of volcanic tuff, and the red and yellow cliffs made famous by painter Georgia O’Keeffe.

Fish Slough, a National Natural Landmark on the eastern edge of the tablelands, includes vivid petroglyphs chipped into bizarrely eroded volcanic tuff formations that overlook a verdant desert oasis laced with meandering spring-fed creeks.

No body was found in the sarcophagus, which was made of volcanic tuff rock, but according to at least one legend, Romulus vanished into the sky following his death to become the God Quirinus, meaning that possibly he never had a tomb.

An inch-wide crack running up a sandstone tower in the Utah desert is rimmed with a dusting of white; an arete of volcanic tuff in Oregon is vertically speckled with bursts of pale powder; ascending a bronze-colored wall in West Virginia is a constellation of silvery smudges.