Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

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

Commemorating the spot where the famous scientist fed his pigeons.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A popular European tradition makes its way to the states on one of America's most famous bridges.

The site of a tragic massacre that spawned a multimedia franchise.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

A hamlet full of permanent Christmas spirit holds one of the earliest theme parks in the United States.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

The great American road trip, but smaller.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

The roadway bend where highway painters practice their craft looks like expressionist art.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

This metallic stampede sits frozen on a Washington ridge yet the artist's vision is still incomplete.

The first declared National Monument in the United States.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

The world’s largest concentrated solar plant generates as many problems as megawatts.

Thousands of turbines whir at at the origin of North American wind power.

These millipedes glow not out of attraction, but as a not-too-subtle warning.