The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

The world's largest piece of copyrighted artwork.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

Over fifty whirling pools left by the glacial age.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

The only diamond mine in the world where you can keep what you find.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

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

Dedicated to "the father of U.S. life insurance."

A steampunk wonderland that preserves America's history of industrial innovation.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This location holds the truth to what truly happened that faithful night.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Archaeologists are still unraveling the secrets of the brutal massacre that wiped out this ancient fort.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.