This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

One of New Jersey's oldest surviving buildings still bears the mark of our former British overlords.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This dramatic rail curve was once the target of a failed Nazi attack.

This abandoned sea fort has become an accidental bird sanctuary.

There has been an astronomical clock on this spot since the 14th century.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

This impressive Boston holy house is the American mecca for Christian scientists.

The oldest experimental corn field in America is still creating better ways to grow crops.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.