This is one really big nut.

A super-sized promotional trick that is now a D.C. landmark.

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

Meet some of the most prominent figures in Black history through life-sized wax models.

Second largest wastewater treatment plant in the country.

America's first federal monument.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

The world's smallest drawbridge.

The Boston square dedicated to the dark poet who was born nearby.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

A motel dedicated to Southwestern nostalgia.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Here lies Lilly E. Gray, an alleged "victim of the beast," but the reason long remained a mystery.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

A self-explanatory attraction allows fans to respectfully remember and honor a comedy legend.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

An original apothecary from 1792.

A monument celebrating the idea of reaching inaccessible places.

At 207 feet, one of the world's longest continuous escalators.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.