Only known mainland rookery of the threatened Stellar sea lion.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

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

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

The famous author's cottage hideaway.

Come for the flowers, stay for the bats!

The place where Samuel "Slater the Traitor" brought the Industrial Revolution to America.

Visit the monolithic tomb of America's most famous general.

One of the only single-person private gravesites in New York City.

See massive fossils that are over 200 million years old in northeastern Arizona.

Ornate "Renaissance Revival" style building.

Four cars from the old system were once on display, but were removed in 2014.

The factory that helped produce a dominant form of lighting before Thomas Edison.

Once home to the country's most gargantuan ships, this graving dock now waits for people to buy furniture.

A community farm in the midst of the Brooklyn concrete.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

“Invented in Key West, Perfected in Brooklyn."

The humble fort that saved Washington.

Brooklyn vintners creating world-class wine in a city not known for its vineyards.

A strip of modern stores in historic buildings.

Lehigh Valley barge No. 79 still gets tugged along - but now it houses a museum and unusual performances.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.