These curious caverns have been home to mushrooms, gangsters, and disco.

Each of these 87 large stones has a unique message. Together, they form part of the Minnesota Military Family Tribute.

One of two giant blue cockerel statues erected with an intentional double meaning.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

When flour explodes, it's not a pretty sight.

A real-life hidden Easter Egg in New Hampshire's capital city

This location of a Mexican chain restaurant has a unique location: an old jail.

The infamous Boston Mob ran rackets from an office here in the 1970s.

A centuries-old church stands as a testament to Boston's "father of architecture."

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

The colonial home of Paul Revere during the American Revolution.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

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

The massive machine creates cracking displays of indoor lightning.

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

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

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

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

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

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

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

Dedicated to one of the darkest moments in Irish history.

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

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.