The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

Oldest synagogue in the United States.

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The "lovely red Vega" of the legendary record-settling pilot.

There’s a hidden military meme engraved on the World War II Memorial.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The oldest living cultivated fruit tree in North America.

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

Rusty red sands line the shores of this Canadian Province.

Go inside the house that inspired L. M. Montgomery to create one of literature's most beloved heroines.

The first American department store, and home to the largest operating musical instrument in the world.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

A monument to the Mohawk people stands along an old Native American trade route.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

More than 200 unconventional musical instruments that anyone can play.

Solar powered Spectacle Island features all-green facilities.

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