This massive airship factory is so large that it has its own indoor weather.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This shallow cave got its name from copious amount of human bones found inside.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

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

Largest Roman Catholic church in North America.

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

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

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

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The national park was once a plantation estate.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Turnip-shaped island just off the Michigan shore in Lake Huron.

This protected area in Lake Huron contains some of the world’s best-preserved shipwrecks.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

The origin of the Nixon tapes is rooted in technological incompetence as much as secrecy.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

Perched atop a brick smokestack, this enormous lug nut symbolizes the local minor league baseball team.

A horse-drawn 1858 steam pumper fire engine encased in glass on the front lawn of a Michigan insurance company.

This campus museum commemorates a national tragedy.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

The 25th President's marble casket can be visited in this classical Ohio tomb.