The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

The old fire tower is one of the last of its kind in the United States.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

Protected from the elements, these Native American rock paintings have survived approximately 250 years.

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

This natural wonderland is a unique chance to explore a Carolina bay, a mysterious geological formation of unknown origin.

The unique circular corral belonging to the “Cattle King” of Oregon.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

More than 300 years ago, a revolt at this Hopi pueblo shaped the future of the American Southwest.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

Colorful curls of hand-blown glass form a captivating tower in San Antonio's Central Library.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

When a guy acquired a free church, he hauled it away piece-by-piece to make it the tasting hall at his vineyard.

This vintage "streetcar boat" lay at the bottom of Lake Minnetonka until the 1980s.

This unique zoo is the only place in the world where you can see all 15 species of crane.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

After four years of grasshopper plagues, this chapel was erected as a plea to God to make them end.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

An architecturally unique lighthouse that had to be lifted up and moved to avoid falling in the sea.

The taxidermy remains of the most popular pony in children's literature.

Natural rock water slides hidden in the remote forests of northern Idaho.