This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

An overlooked and unassuming engineering marvel.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

A Roman-style column in Oregon hides a spiral staircase inside.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This bridge provides safe passage for squirrels.

Where Nor'easters go to die.

A massive sea stack famous for its appearance in The Goonies.

Outside this souvenir shop is a statue of Bigfoot composed of volcanic ash, and plenty more to see inside.

Dramatic river bend surrounds a natural red-rocked pedestal.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

Ancient pueblos built into the base of a natural canyon wall.

See massive fossils that are over 200 million years old in northeastern Arizona.

A motel dedicated to Southwestern nostalgia.

This sanguine boulevard was named after a deadly cowboy bar fight.

A stealthy Apache hideaway that became the haunting site of a mass grave.