This picturesque cottage was the site of Ulysses S. Grant’s final and perhaps most important campaign.

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.

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

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

The resting place of a Civil War celebrity's amputated limb.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

Oldest and rarest examples of telecommunication in the world.

This now-deactivated naval base defended the Florida coast for centuries.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Colloquially known as "the lynching memorial," this is the United States' first memorial to the victims of racial terror at home.

The "lovely red Vega" of the legendary record-settling pilot.

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

Inside houses a vast collection of military aircraft and missiles spanning the ages.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

The secret city built by the Manhattan Project.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

The wooden airship was the largest flying boat ever built.

100-year-old shipwreck you can walk up to at low tide.

A simple plaque remembers a California island massacre that claimed more than 100 lives.

Commonly referred to as the most photographed Victorian home in the United States.

Folk art crafted from discarded vegetable crates.

Elevated freight railway turned wildly successful urban park.