The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A huge musical instrument played by the ocean.

Concrete strongholds stand guard over the Golden Gate.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

The unbelievably opulent home built for an infamous newspaperman.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

North America's largest accredited model railroad museum.

100 massive sculptures in the Hudson River Valley.

Why have you never heard of the second most popular tourist site in New York?

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

An enormous, inside-out glass globe built in 1935.

Bouncing, delightful, mechanical art at the MIT Museum.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.