This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

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.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

Detroit’s Eastern Market has been transformed into an outdoor museum with colorful murals that address social issues and symbolize the city.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Macabre astrological automaton clock dating to the late 1400s.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The only rotating bar in New Orleans has been slowly spinning since 1949.

A beautiful geyser under environmental threat.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Dramatic river bend surrounds a natural red-rocked pedestal.

Baroque celebration of the end of the Great Plague of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The beautiful baroque library of the Hapsburg empire.

This cheese shop also houses a museum devoted to Dutch dairy.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The fairy tale castle of the "fairy-tale king."

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.