Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A century-old network of freight tunnels underneath the city's historic business district.

This historic cliffside mansion uses a natural cave for air conditioning.

A museum dedicated to the history and exploration of both popular music and science fiction.

What's that on the side of that building? Va Va Voom, it's Bettie!

Homemade rockets, dinosaurs, and robots make this New York small business much more than a furniture store.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.