A cave's rare beauty held a cavernous secret hidden underground.

A clear blue swimming hole with hidden caves, still unexplored.

This museum of miniature displays provides a journey through early American history.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

The remains of this visionary community can still be found much as it was a century ago.

Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

First a root beer ad, then a golf course clubhouse, and finally a massive teapot.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

A quirky collection of outsider art made from automobile parts.

Continuing a tradition of movie magic on the site of America’s oldest continually operating movie theatre.

A nondescript Seattle restaurant inherited a piece of European history.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

The world's largest piece of copyrighted artwork.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

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

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

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

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

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

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

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

A curiosity-seeker's paradise set inside a three-story historic school house.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.