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

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

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

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

The world's longest known cave system.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This popular pilgrimage site offers a hole filled with holy healing dirt.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Legends surround this jagged rock formation in the New Mexico desert.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

100 massive sculptures in the Hudson River Valley.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

This small-town pizzeria won the Hollywood lottery.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.