The longest covered bridge west of the Mississippi River.

An inconspicuous footbridge beloved by San Diego locals.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

This historic graveyard was partially paved over to create a streetcar line.

San Diego's most historic and haunted home.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

The tiniest tiki room in San Diego.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

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

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A unique home built by Andrew Jackson Caldwell that also served as a military hospital.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

The world's longest known cave system.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

This twisty sign depicts the chain's first logo.

Inside this clubhouse is a cinephile's paradise.

The decor of this Hollywood movie palace just barely predated the opening of King Tut's tomb.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

This Hollywood dive houses a mural painted by the artists who animated its namesake film.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.