A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

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

The "Seinfeld" diner.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

This former hub for crafty philosophers was founded by a writer who died aboard the infamous RMS Lusitania.

A 19th-century architectural wonder designed by the "father of the skyscraper."

The seat of Buffalo government is a gorgeous Art Deco palace.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

A bar, burger joint, and arcade housed in a late 19th-century church building.

"Call for the doctor, call for the nurse... Vote!! said the lady with the alligator purse."

The floor-to-ceiling collection in an old factory is a unique alternative to stuffy galleries.

A room hidden behind a swinging shelf in the children's section.

The Fox Sisters, America's leading mediums in the mid-19th century, possessed a table they claimed helped them "communicate" with the dead.

A collection of the best toys ever made, The National Toy Hall of Fame is filled with kids, fun, and for some reason, a bird preserve.