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

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.

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

At 207 feet, one of the world's longest continuous escalators.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The first home of the doomed aviatrix Amelia Earhart.

The world's longest known cave system.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

World's largest Christmas store.

A bizarre house filled with an astounding array of collections.

A place to eat for on-the-run agents and espionage enthusiasts.

World's second largest particle accelerator, where nature reveals its secrets.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Shop of curiosities with a dinosaur museum tucked in its basement.

Pizza with a side of fine art.

A science teacher's dream.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

An antiquated German apothecary on Chicago's North Side.

An enormous park-like oasis, full of famous Chicagoans' graves.

A hot dog stand where the heads are just as hot as the dogs.

Huge abstract sculptures of the Puerto Rican Flag.