The only structure left with direct ties to the Salem witchcraft trials of 1692.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

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

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

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

A Christian monastery stands on what was once a holy Incan temple.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

Ice cream stand, snack bar, and time capsule of milk conveyance.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

A men’s restroom became a sandwich shop.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.