A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

There must be a pun in this haystack somewhere...

A second generation sun-powered marvel lights up the night.

Avoid gangster interaction while window-shopping.

An artist's cute bronze subway sculptures belie his violent artistic past.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A 19th-century cabin built into a hollowed-out Sequoia tree.

Quite simply the largest tree in the world (by volume).

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

In a city crazy for seashells this museum educates and amazes visitors using the wonder of cast-off exoskeletons.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

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

Neglected resting place of some of the city's early luminaries—and a woman encased in concrete.

A community of collapsing homes more than a mile out from the Florida coast.

This outdoor gallery of sculptures along the East River was once a landfill.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Guerilla gardeners reclaimed this abandoned railroad land literally putting down roots.

Constructed in the 1920s, this former pencil factory is now an office building.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The most confusing clock in New York.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.