A tiny piece of the Moon is embedded in this stained glass masterpiece.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Home to items never before seen by the public.

Beautiful views and Roman-style statues on the Italian coast.

Ancient snack bar of the Roman Empire re-opened.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

The United States Capitol's former columns still stand.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

A priceless collection of the Nation's cryptologic history.

At 207 feet, one of the world's longest continuous escalators.

The site of the climactic scene from the classic horror film is now a historic landmark.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

A nostalgic bibliographic gem.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A 60-room castle constructed by a horse-racing heir.

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.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.