The homestead of American patriot John Adams.

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

These unusual rooms on wheels are holdovers from the 1960s.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

An alternate history park where the Union Army loses the war... to dinosaurs.

A 120-year oil leak slowly unleashes more gallons of oil than the Exxon/Mobil disaster.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

The first piece of public art dedicated to LGBT rights.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

This forlorn park is the result of a failed investment turned tax dodge.

This translucent sculpture represents a quintessential component of New York City's skyline.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

This graceful little figure is a one-of-a-kind version of the cherished character.

A decommissioned military complex that's now a modern industrial park.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.