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

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Red frames showcase remnants of one of New York's original subway stations.

The most confusing clock in New York.

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

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

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

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

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

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

The largest self-built castle in the U.S., six decades in the making.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The highest bridge in America was built for an almost unnervingly small amount of money.

Victorian "Fancy Craft" Hair Wreaths and Relics.

The largest source of fossilized insects anywhere.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This super steep hike ascends 2,000 feet in less than a mile.

This enigmatic building features numerous architectural styles.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

There are eight natural springs around town, each with a slightly different taste.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.