A speakeasy takes on Chicago's drinking culture.

A lush green oasis in the middle of Chicago.

One of the only single-person private gravesites in New York City.

This Queens beer hall preserves a German culture and language that is all but lost.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Collect holy water from a Bronx grotto.

A retired subway car stands alone in a field in the middle of Queens.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

The first piece of public art dedicated to LGBT rights.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

Harlem park dedicated to compulsive hoarders killed by their own junk.

Historical figures from New York City's Catholic community reside in Midtown.

This small and serene place for quiet reflection on Staten Island was built in China based on the gardens of the Ming Dynasty.

Salute the leader of the proletariat.

The notorious headquarters of a corrupt political machine.

Come for the pastrami, stay for the million-dollar art.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

One of Ireland's most infamous prisons for rebels including men, women and children.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

A whimsical, but often overlooked clock in Park Avenue.

Cryptic messages embedded in the New York City sidewalk.

Visit the monolithic tomb of America's most famous general.