This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The site of Paul Revere's historic two lantern warning.

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

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

A set of rowhouses built for laborers at a glass company are the last of their kind in Annapolis.

This Annapolis home was built by one of the signers of the Declaration of Independence.

The oldest military monument in the United States.

The only remaining historic maritime signal station in the United States.

Trinkets and toys lovingly handmade by maximum security prisoners.

This candy-striped tower is the farthest east you can go in the United States.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

This tiny patch of arid sand sits in one of the greenest states in the United States.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

Before Nixon, "watergate" meant canals.