This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

America's only nuclear missile silo open to the public.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Dramatic river bend surrounds a natural red-rocked pedestal.

Rippling sand dunes frozen in the Arizona rock.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A ghost town that held steady longer than most, but finally gave up the ghost.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A monument to the conquistador became increasingly controversial in the very city that he founded.

This space-age looking obelisk rises over a city in the rainforest, meant to resemble the local castaña tree.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.

Akureyri is home to an oversized can of one of Iceland's favourite beers.

This beautiful, historic church looks like something out of a simpler past.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

The oldest church in Iceland is one of the few to feature ornate decoration.

The most powerful waterfall in all of Europe.

This elegant arc of a waterfall marks a religious turning point.