Hidden inside a gift shop that doubles as a museum, this gargantuan yo-yo can only be operated by crane.

A tourist attraction founded around a slumping cabin.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

These two monoliths have stood at the entrance to the neighborhood since the days it was called "Hollywoodland."

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

Where Nor'easters go to die.

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

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

Only known mainland rookery of the threatened Stellar sea lion.

This large artificial waterfall in Washington state was merely an incidental byproduct of a technological megaproject.

People come from across the globe to swim in this lake believed to have healing properties.

Seattle’s Whimsical Mural Master.

Site of the greatest known waterfall that ever existed.

A giant milk bottle from the 1930s beckons drivers to this diner.

Every drop of water in this 27-mile long reservoir was pumped up from the Columbia River using power from Grand Coulee Dam.

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

A black cottonwood gets a second life as a home for books.

This house was largely built out of hundreds of thousands of discarded glass embalming fluid bottles.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

There’s a special club house at the top for the bell ringers.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

The first declared National Monument in the United States.