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

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

Suburban observatory was personal lab of the father of modern astrophysics.

A building so large that it has its own weather.

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

Three hundred years of preserved Spanish colonial history in San Antonio.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

A nondescript Seattle restaurant inherited a piece of European history.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

3/4-scale model of the White House in Atlanta, Georgia.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

Commemorating the spot where the famous scientist fed his pigeons.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This stoic, if derpy, giant stands as a monument to Oregon's statehood and the novelty culture of yesteryear.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

A nostalgic bibliographic gem.

The walls of the iconic dome are hollow and have a secret stairway.

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

The world's largest squirrel statue clutches a pecan bigger than your head.

Unrepaired walls from a 1920 anarchist bomb attack.

Portlandia is the second-largest copper repoussé statue in the United States.