Hear the quietest sound from across the dome.

The second oldest continuously operating bar in Louisiana.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

A dilapidated dock tells the story of Titanic's missed arrival.

Home to items never before seen by the public.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

A walk through the historic city center, under the streets of Seattle.

A layered tribute to the work of mosaicist Isaiah Zagar.

Try not to get slimed in Tribeca.

World's first "penitentiary," meant to be humane, drove men insane.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

A theater sits abandoned on Roosevelt Road, once majestic in splendor, now majestic in decay.

The palatial McDonald's that inspired Wesley Willis.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

Huge abstract sculptures of the Puerto Rican Flag.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

To find the "unicorns of the deep" you've got to go downstairs.