This lovely hilltop tower was specifically built to withstand 100 MPH winds.

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.

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

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

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

This impressive Boston holy house is the American mecca for Christian scientists.

The massive machine creates cracking displays of indoor lightning.

This tiny structure was built by the creator of the Brooklyn Bridge.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

This 19th century granite fortification is one of the most well preserved forts in New England.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

This historic park site contains the last remnants of a once bustling canal system.

Long tunnels run under the ancient chariot racing circuit to the tower.

A parade of antique steeds offers a quirky ride through history.

The Vatican of the movie industry turned into an actual church.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.