The metal bolt was planted in the early 19th century by the man who laid the groundwork for Manhattan's grid system.

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

Key’s song helped transform the “stars and stripes” from a mere battle flag into a sacred symbol of national pride.

This week's historical challenge is a little different: Can you put these images (plus others in the story) in chronological order?

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

Through “a simple twist of fate,” Joan Baez stayed with me on the Upper West Side for four days.

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

"We want no beer or ballet on the West Side."

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

Historical research will become more fraught and less fun when you don’t know what you can trust.

Do you know where and when this photo of the Upper West Side was taken?

Our attempt to get to the bottom of an Upper West Side mystery.

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

The Code of the West may have found one of its most enduring voices right here at 74th and Columbus.

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

A lesson from "What Is This?": Blizzard warnings are triggered by wind levels, not by a specific level of expected snow.

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

The castle-like First Battery Armory, more than a century old, is an UWS example of adaptive reuse.

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

In World War I-era raids, the federal government detained "slackers" on the UWS and throughout the city.

"The shop is very Upper West Side," says one longtime patron.

This photo was taken on the UWS, sometime in the past. Do you know where, when, and what it shows?

Rag Radio spoke with Rob Garber, author of the Rag's biweekly UWS Historical Photo Challenge.

Schrader's memoir-in-vignettes is full of stories of a vanished New York.

In honor of Marty Reisman, UWS table-tennis legend and inspiration for the movie "Marty Supreme," here's an historical ping-pong challenge.