Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

This picturesque abandoned home is rumored to be a spite house.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The massive machine creates cracking displays of indoor lightning.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

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

The pioneering photographer's prints are immortalized inside her childhood home.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

While it now takes more than a dime to open an account this historic Brooklyn bank still displays the opulence of the gilded age in which it was built.

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

Final resting place of the immigrant who brought artificial seltzer water to America.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

This Orthodox Church's exterior is rather unorthodox.

This 19th century brick building in Brooklyn stands out like the anachronistic landmark that it is.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.