Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Once home to over 8,000 exiled Hawaiians suffering from Hansen's Disease.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

Oldest building in California still in use.

Sports history, made in the Arroyo Seco.

Bug-devouring flora are the stars of a special wing of the glass conservatory.

A "haunted" landmark on the coast of Southern California.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Home to a protest movement, a bombing, and a dramatic change in labor history.

The home, museum, and death site of Kodak's influential founder.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Pluto is still considered a planet in Ithaca, New York.

Impossibly life-like natural history models created out of glass by a father and son.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Ride the subways of yesteryear.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

New York City's smallest piece of private property.

One of only two commuter aerial tramways in the United States.