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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The Boston square dedicated to the dark poet who was born nearby.

Two thousand artifacts from around the world collected by one woman who loved to travel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

An enormous, inside-out glass globe built in 1935.

Honoring combatants from Portsmouth who served in Cuba and the Philippines during the Spanish-American War.

One of the Treasury Building's original columns now sits as a garden monument in the middle of a busy military base.

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

America's first federal monument.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

The oldest military monument in the United States.

The smallest covered bridge in Maryland.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

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

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

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

Once America's tallest structure, now a Baltimore landmark.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.