One of the few working locomotive roundhouses in the United States.

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

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

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

Opulent downtown movie theater now houses cars as an indoor parking garage.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

Dating back to the 1800s, two imposing buildings in Michigan have had countless transformations over the years.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The park that the Chicago Stockyards built.

The world's largest collection of the world's largest objects is in one small Illinois town.

Elvis's own personal tropical hideaway.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The famous Beatle secretly visited this Illinois town several times to visit his sister.

You were once able to challenge a chicken to tic-tac-toe at this park, which is now converted into the Aikman Wildlife Adventure.

This folk art wall claims to be the world's one and only memorial to the bygone age of hippies.

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

One of the finest examples of a black soil prairie that was barely saved by the Great Depression.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

The final resting place of President Chester A. Arthur and hundreds of others from Revolutionary War soldiers to poets, politicians, and painters.