Once seen as a bit of an eyesore, this sculpture has become a staple of downtown Houston.

This replica of the Greek structure is in the heart of Nashville.

A white oak with property rights.

After just one epic test blast, this literal loose cannon proved too explosive for combat.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

Memorial to a beloved puppeteer as well as all street performers.

One of the last remaining movie theatres in the country that features a rear-projection system.

This plaque is dedicated to one-half of the Magliozzi brothers and their hit radio show, 'Car Talk.'

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

This public park was the site of the largest civilian disaster of the Civil War.

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

The world's first aircraft factory has been hiding inside an automobile plant for almost 80 years.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

A real flying saucer, contracted by the U.S. Air Force.

A place for ship-lovers to watch the passage of freighters traversing the Great Lakes while learning about their history.

Full-sized barn houses many restored instruments.

In Grand Rapids, Michigan, a marker honors the creation story of a proud fictional culture.

Michigan’s most famous shoe tree.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

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

Former self-sufficient mental institution now a planned community.

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

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

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