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Welcome to Scientific American Science Talk and happy Halloween.

In the spirit of spirits, we'll take a walking tour of one of the great cemeteries

in the United States, Woodlawn Cemetery in the Bronx, New York, where more than 300,000

people do not live, including Duke Ellington, Miles Davis, Herman Melville, F.W. Woolworth, Fiorella Liguardia, Bat Masterson, and Joseph Pulitzer.

But since we're science people, our focus is going to be on the geology, especially that of the rock used in the more than 1,300 opulent mausoleums to be found at Woodlawn Cemetery.

And we'll get some culture, too.

You'll hear the voice of Susan Olson.

She was the executive director of the Friends of Woodlawn Cemetery when this was recorded.

And you'll hear the geologist Sidney Horanstein.

This tour actually took place in 2008 and I put up much of the audio for Halloween 10 years ago,

but here's a slightly revised version and now let's go hang out at a cemetery.

The most prominent stone is the one you're standing on right here, and this is from Milford, Massachusetts. It's about 350 million years old, and you probably all of you have seen it,

because it's the main entrance of the Museum of Natural History on Central Park West. It's the same stone.

Unfortunately, there, they tried to clean it. And several years ago, and they used hydrofluoric acid

to clean it, so it's bleached white. But it's beautiful pink granite. If you want to see what

...