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

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

A 19th-century architectural wonder designed by the "father of the skyscraper."

The seat of Buffalo government is a gorgeous Art Deco palace.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

Soaring over the Niagara Whirlpool since 1916.

Most-visited and most-photographed slot canyon in the American Southwest.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This historic national park is covered in the stunning ruins of red rock pueblos.

A spiritual vortex among the red rocks in Sedona.

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

Where beautiful signs live on forever.

An art deco ice cream shop covered in vintage train station tiles.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A vast collection of rare, historical, and vintage supercomputers.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

This museum honors the composer of “Swannee Ribber.”

This abandoned bridge is now a favorite haunt for graffiti artists.

Florida's first suspension bridge.

This state park was once an important Native American cermonial center.

One of only two pod-shaped homes designed by Frank Lloyd Wright.