The "Sultan of Swat" once attended a school at the site of this baseball field.

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

Wedged between two sets of row houses is an awkwardly located family graveyard.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

Once America's tallest structure, now a Baltimore landmark.

The likeness of the Baltimore music icon was unveiled in time for the anniversary of his Senate hearings on music censorship.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

The last slot car racing arcade in Brooklyn is keeping the dream of speedy little autos alive.

Once a ferry dock, radio transmitter, and now a new Greenpoint park.

Where one of Greenpoint's "five black arts" was practiced.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

This recently uncovered ad for Lindsay's run at Mayor in 1965 had been hiding for decades underneath a billboard.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

A strip of modern stores in historic buildings.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

Love is in the air along the small street in Brooklyn.

2,000 barrels of aging beer hidden in a warehouse at the Brooklyn Navy Yard.