A mysterious stone embedded at the base of a historic Boston building.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The beloved home to all publications indie, erotic, and punky.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This shop for all your super spy needs hides an educational secret.

The ruins of the castle that chemicals built.

For over 20 years, Lil Toot has delighted guests with narrated boat rides between Stearns Wharf and Santa Barbara Harbor, becoming a beloved local legend and top-rated experience for visitors.

Otherworldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

The abandoned remnants of a little sanctuary for world peace that fell into disrepair.

A brick-paved former section of the historic coast-to-coast highway.

Home of mutant livestock.

This three-dimensional brick mural is the longest of its kind in the United States.

A mysterious and terrifying public art goblin seemingly meant to inspire local legend.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

One of Cincinnati's greatest fighters once trained at a now defunct gym in this Over-The-Rhine neighborhood.

The 25th President's marble casket can be visited in this classical Ohio tomb.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.