This incredible collection of vintage pinball machines can be played at 25 cents a pop.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The first American department store, and home to the largest operating musical instrument in the world.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The world’s first penitentiary, meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Continuing the tradition of the dime museum in style.

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

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

The world's largest piece of copyrighted artwork.

This supermarket is suspended 25 feet above an interstate highway.

Radical Bookstore and Community Space.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This impressive Boston holy house is the American mecca for Christian scientists.

An enormous, inside-out glass globe built in 1935.

No one messes with the Massachusetts sacred cod, not this time...

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.