Beautiful steampunk ghosts of early Massachusetts.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

On the Hudson resides one of the largest clocks in the world.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

A unique sculpture park that specializes in the huge and bizarre.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A Circus legend leaves an unexpected endowment.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

This is one really big nut.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

A multi-storied adobe complex has been inhabited for more than a thousand years.