A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

This translucent sculpture represents a quintessential component of New York City's skyline.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

There must be a pun in this haystack somewhere...

The 28-foot granite map plots the locations of 40 theaters in New York City.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

One of the few Glatt kosher delis in the United States is a cornerstone of its Hasidic neighborhood.

Established in 1937, the oldest candy shop in New York City boasts a rainbow-colored inventory that would make Willy Wonka envious.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

This beloved marketplace mascot poops money and grants good luck.

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

The home of one of America's most beloved fictional characters has become a real world landmark.

Self-sufficient greenhouse floating on the Hudson River.

A waterway covered over after the Industrial Revolution has been unearthed and cleaned up, for the enjoyment of fish and humans alike.

This collection of hand fans doubles as a history of femininity.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.