This is 99% invisible. I'm Roman Mars.

All right turning on to South Temple Road.

Road place. It's just called South Temple.

South Temple is in fact the complete name of the street on which our

producer Sam Greenspan is driving crossing 500 east exactly 660 feet later Sam

drives across the next major street. Here's 400 east.

And 660 feet after that.

300 east.

If you recognize the streets that Sam is calling off,

you already know exactly where he is.

And what he's about to see.

200 East.

And now here's State Street, which seems to work like a 100 East.

Wow, there it is.

Oh my gosh, that is the Mormon temple.

The Salt Lake Temple of the Church of Jesus Christ of Latter-day Saints in Salt Lake City, Utah.

It's quite striking. It's beautiful. The urban grid of Salt Lake City, Utah is designed to tell you exactly

where you are in relation to Temple Square, one of the holiest sites for Mormons.

I first learned about this when I was writing a letter to a friend in Salt Lake

whose address was like 300-something south 2,100 East Salt Lake City UT which to me

sounded less like a specific house number and more like a set of

coordinates but that's pretty much how every address works in Salt Lake City and in

...