The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Home to items never before seen by the public.

These pretty kitties killed and ate as many as 135 railway workers.

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A semi-scholarly approach to sex.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

The resting place of a Civil War celebrity's amputated limb.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The statues honor the state transportation employees who've died while performing their work-related duties.

A 12-foot sculpture serves as a constant reminder of the importance of protecting and restoring the Boardman River.   

This freshwater spring fills with 10,000 gallons of water per minute.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

This shallow cave got its name from copious amount of human bones found inside.

World's largest Christmas store.