A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

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

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

This vacant church in the Financial District was once the heart of New York's first Syrian immigrant community.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Oldest unrestored plantation house in America that is open to the public.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.