San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

This shop specializes in oddities and Victorian-inspired wonders.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Elevated freight railway turned wildly successful urban park.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

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

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

This landmark cemetery in Boston was created more than 300 years ago.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The site of Paul Revere's historic two lantern warning.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

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.

Numerical symbolism abound at East Asia's oldest observatory.

A battle between nature and architecture in the Cambodian jungle.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.