This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

A beautiful Victorian-era cemetery, complete with a miniature village.

The gravestones in this lost burial ground were bulldozed and replaced with houses and a dog park.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

You must take the A train... to the last active cemetery in Manhattan.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This little-known rival to the Library of Congress houses one of the largest collections of pre-1876 American books, newspapers, and manuscripts.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

Home to the Titanic Historical Society's collection.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

Friction between grains of sand cause a curious "singing" sound.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

An eccentric inventor's castle home with its own indoor weather system.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

The only place for a truly presidential dram.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.