Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

New fungal and bacterial species call this deadly lake home.

These giant metal horses graze on a hilltop near the Montana highway.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

A smoke stack so large, the Washington Monument could fit inside!

The only road through the heart of Glacier National Park.

A once celebrated industrial wonder now lurks in a quiet corner of Flathead Lake.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

A wild west land agreement was etched right onto this historic Idaho stone.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

Tiki luxury on Nob Hill.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Only known mainland rookery of the threatened Stellar sea lion.

Fifty years after a “blast blasted blubber beyond all believable bounds,” this idyllic natural area commemorates the carnage.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

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

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

I Street Bridge is the heaviest swinging center bridge in the United States.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

Art Deco stylings conceal the true nature of this bridge.