Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A self-built castle made by a mysterious man.

Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

A 140-year-old castle with underground caves hidden in San Francisco.

Antarctica's bustling metropolis, originally established by Richard E. Byrd.

Quite possibly the most isolated bus stop on Earth.

The steep slope known as “Ob Hill” overlooks an Antarctic research station.

This giant head is all that remains of a once proud statue that survived an earthquake but not a fall off of a wagon.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

A deep toxic lake fills this abandoned open-pit copper mine, now a Superfund site.

This sign designates the road that leads to the infamous Area 51.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

This super-sized skillet is a replica of a usable giant pan where a woman once skated on bacon.

The longest spit in the United States ends at a lighthouse in the Strait of Juan de Fuca.

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

The boulder is a landmark, public art, and an icon.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

In the absence of a Chinese-language newspaper, for years the community posted daily updates on this simple bulletin board.

A small town market proudly displays numerous taxidermied animals along its walls.

The only surviving piece of a submarine said to be the most decorated vessel in U.S. history.

City Council meetings still happen in this historic building, impeccably preserved on the inside.

A bust of the first president welcomes visitors to the only town in America called George, Washington.

This sci-fi gazebo located in a Washington power town is made from old bits of industrial electrical equipment.

Sweet or salty, super hot or mixed into beer, this is the holy land for all things licorice.