An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

This blowhole is supposedly caused by a trapped monster.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

This statue intended for children to enjoy became a minor political spat.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

Stolen goods adorn the organ at Old North Church.

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

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

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

A more than 260-year-old crypt built on Boston's oldest English burial ground.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

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

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

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The massive machine creates cracking displays of indoor lightning.

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

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.