These massive concrete balls were used to mine gold in Virginia.

Giant busts of 42 U.S. presidents sit, crumbling in a field in Virginia.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The largest Buddha statue in the Western Hemisphere is just 50 miles north of NYC.

Astonishing collection of helmets, scientific instruments, and medical models.

This high-perched pachyderm marks the memory of not one, but two elephants gunned down in small New England towns.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

The oldest farmer's market in America is so ancient it was approved by the King of England.

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

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

A home that witnessed Civil War combat on the Sunken Road has the battle scars to prove it.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

This landmark building is now a vibrant performing arts space with musical acts from around the world.

This Orthodox Church's exterior is rather unorthodox.