The largest retailer of seashells in the world.

An eclectic treasure trove of maritime marvels.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

An oddities shop that dabbles in the deathly and beautiful.

Artifacts fill the old headquarters of the hugely influential political movement to ban alcohol in the United States.

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Washington's iconic carousel has a nice piece of Civil Rights history.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

This lovely pocket park is one of the most under appreciated in D.C.

Perhaps the most scandalous statue of America's first president.

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

There's a crumbling old mansion inside the Smithsonian National Zoo.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The site of the climactic scene from the classic horror film is now a historic landmark.

Where the Model T was made and the assembly line was invented.

Detroit’s downtown castle is one of the oldest structures in the city.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

The headquarters of a pioneering cast iron and cast aluminum cookware company is in ruins, but still standing.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A 30-foot stack of piano keys memorializes one of the greatest keys players in jazz history.