The oldest surviving wood-frame building in North America is still in the family.

Tucked away on Somerville Avenue is a curated mycological gallery.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

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

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

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

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

This hotel was the site of major events in sports and radio history. It was also used as a detention center during World War II.

This Dutch-styled residential building was originally a cocoa company's World's Fair showpiece.

Inside a grand Victorian-era carriage house is the oldest automobile collection in the United States.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

The oldest playground in America.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

One of the now-less-hidden floral gems of the "Emerald Necklace."

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

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

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

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

A winding path built in secret on the edge of the continent.

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

A monumental cross hides in the trees in Golden Gate Park.