Search the street for hidden cats, all up to different kinds of mischief.

The bench featured in the film with Robin Williams and Matt Damon has become a popular destination for moviegoers.

The colonial home of Paul Revere during the American Revolution.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

This steep slide at a kids’ playground went viral after an police officer tumbled down it.

Interactive museum complete with costumed re-enactors and the only known surviving chest from the Boston Tea Party.

The world's largest piece of copyrighted artwork.

This popular Boston haunt is reminiscent of a time gone by, when slow cafes and sweet-smelling smoke wafting from patios was the norm.

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

Narrowest house in Boston.

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

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

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

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

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

A mammoth WWII anti-air defense tower has been repurposed as a hotel with a rooftop garden.

Model Trains and Much More in Hamburg.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

This stained glass window designed by Tiffany Studios is hidden behind the circulation desk of a public library.

This historic church with a connection to "Uncle Sam" is now a fraternity house.

This relic of 19th-century infrastructure is one of the few remaining coal gas storage tanks in the U.S.