The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

The National Park Service’s best-kept secret with views that rival any in D.C.

Also known as the Founding Church of Scientology.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

Perhaps the most scandalous statue of America's first president.

Home to a vast and influential collection of Shakespeareana.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

An urban laboratory.

Miniature art that tells an enormous story.

A spiritual vortex among the red rocks in Sedona.

America's only nuclear missile silo open to the public.

A reproduction of earth's many biomes.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This steamer is known as "The ship that built Cleveland."

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

This Czar-funded, onion-domed, lavishly muraled Orthodox Church played a starring role in "The Deer Hunter."

A collection of witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.