Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

This free, take-a-book shop seems like a trick but isn't.

Meet some of the most prominent figures in Black history through life-sized wax models.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

Eighteen miniature death-scene dioramas.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Giftshop catering to cryptozoologists and anyone with a sense of humor.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

Final resting place of the most prolific Fijian cannibal of all time.

Museum of Fijian history, including its former tradition of cannibalism.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A Japanese pilot crash-landed on this Hawaiian island after the Pearl Harbor attack and terrorized locals for a week.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A museum befitting the city responsible for supplying the majority of the world's LSD.

An art collective teaching the more fiery, metal-y art forms.