A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

An Irish Memorial commemorating those who perished due to potato blight.

The world’s first penitentiary, meant to be humane, drove men insane.

Residents of this Brooklyn neighborhood may be unaware their houses sit atop a buried trolley graveyard.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

Abandoned power station once home to a squatter community, now being developed into an arts center.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

Now the site of a high school, this was almost the location of the largest cathedral in the US.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

Oldest surviving example of a Dutch saltbox frame house in America.

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

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

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

A beautiful geyser under environmental threat.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.