The largest battery in New England sits atop a Massachusetts mountain.

An outdoor display of military missiles developed at Point Mugu Naval Base.

An underground blaze turned this village into a ghost town.

At this rural museum, visitors can experience "Boomtown U.S.A.," a lifelike re-creation of an oil boomtown in the 1930s.

Home to Hollywood history and a very special salt crystal.

A museum dedicated to the history of electric interurban transit near the home of the first electric trolley system in the United States.

Abandoned blast furnaces are an enduring reminder of Scranton's once booming iron business.

Construction uncovered this trove of fossils, which visitors are welcome to add to their own collections.

Exhibiting the tallest structure of its type in Nevada, this massive mining complex is frozen in time.

Under the right conditions, rocks will move across this dry lakebed, leaving trails behind them.

The entire history of the U.S. Space Shuttle Program is painted on an enormous roadside water tank.

A free museum that memorializes the deadliest river flood in American history, and the civil engineering efforts to tame the Mississippi River.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

A volcanic core jutting above the plain between the Snake and Boise Rivers, a marker identifies the reference point for all U.S. Government Surveys in Idaho.

A boulder so big and tough, they had to turn it into a landmark.

A new monument to an old grave that was uncovered during the rebuilding of a California ghost town.

One of the world's oldest continually operating bookstores.

This colossal underground passage paved the way for large-scale drainage and access tunnels across the U.S., but it almost wasn’t built.

A professional special effects makeup artist’s collection of horror creatures and one-of-a-kind recreations on display in downtown Boulder City.

What once housed a private club catering to Comstock Lode elite is now considered one of the West’s most haunted spaces.

This pristine World War II airfield gives a comprehensive look at atomic development and aviation history.

This observation tower is a longstanding, 1960s landmark in the Thousand Islands region of Canada.

Examine the impact of the horse on Great Plains culture through exhibits on ranching, rodeo, and the Native American way of life.