Take a look at Copley Square photographed #onthisday in 1914!

It's #mysteryphoto time! Do you know when and where this was taken?

Check out the corner of Summer and Kingston Streets #onthisday in 1903!

It's time for another #mysteryphoto! Can you figure out where and when this photo was taken?

Happy 87th birthday to former mayor Raymond L. Flynn! Image 1: Mayor Raymond L. Flynn in his office Image 2: Mayor Raymond L. Flynn running Image 3: Mayor Raymond L. Flynn playing baseball

Take a look at the Boylston Street subway entrance near the Public Garden #onthisday in 1915!

Here's a new #mysteryphoto for you Boston! Can you figure out when and where this photo was taken?

As the tall ships get ready to leave port, we are looking back on some memories from Operation Sail Boston in 1976!

Check out construction work at Forest Hills #onthisday in 1908!

Check out Dover Street Station on the Elevated Railway #onthisday in 1959!

It's #mysteryphoto time! Do you know where and when this photo was taken?

250 years ago today, the Continental Congress adopted the Declaration of Independence! Check out these tickets and programs from celebrations in 1876! #Boston250 Image 1: Anniversary Exercises ticket Image 2: Evening Concert ticket Image 3: Anniversary Exercises program Image: 4: Timber Races flyer

It's time for another #mysteryphoto! Can you figure out where and when this photo was taken?

Take a look at the Charlestown Navy #onthisday in 1901!

Here's a new mystery photo for you, Boston! Can you figure out where and when this photo was taken?

Check out Atlantic Avenue at Rowes Wharf #onthisday in 1942!

Happy Pride Month! Check out Mayor Menino marching in the 2009 Pride Parade! Image 1: Participants marching behind the Boston Pride Parade banner in 2009 Image 2: Mayor Menino marching in the 2009 Boston Pride Parade Image 3: Mayor Menino marching in the 2009 Boston Pride Parade

In honor of #Juneteenth, check out these photos of the 2023 Juneteenth Flag Raising and Parade! Image 1: People marching in the 2023 Juneteenth Parade Image 2: Mayor Wu speaking at the 2023 Juneteenth Flag Raising and Parade Image 3: Participants at the 2023 Juneteenth Flag Raising and Parade

It's #mysteryphoto time! Can you figure out where and when this photo was taken?

The Battle of Bunker Hill took place #onthisday in 1775! Take a look at Mayor John Collins watching the Bunker Hill Day parade in 1963!

#onthisday 25 years ago, long-time Bruins captain, Ray Bourque, brought the Stanley Cup back to Boston after winning it with the Colorado Avalanche. More than 10,000 fans showed up to City Hall Plaza to celebrate the legendary Bruin, even though he won the championship for another team!

Here's a new #mysteryphoto for you! Do you know where and when this was taken?

City Square Station in Charlestown opened #onthisday in 1901! Check out this photo of the station taken on June 29, 1909.

It's time for another #mysteryphoto! Do you know where and when this photo was taken?

Take a look at the Charlestown Bridge, photographed #onthisday in 1901!

Happy #PrideMonth, Boston! Check out these photos from the 2016 Boston Pride Parade! Image 1: Mayor Marty Walsh cutting the ribbon at the 2016 Boston Pride Parade. Image 2: Mayor Marty Walsh and others marching in the 2016 Boston Pride Parade.

Here's a new #mysteryphoto for you, Boston! Can you figure out where and when this photo was taken?

In honor of #JewishAmericanHeritageMonth, we are highlighting Leopold Morse. He was the first Jewish person elected to either house of the US Congress from a Massachusetts seat, which he held from 1877 to 1885 and from 1887 to 1889. Image: Leopold Morse and Company Clothiers, circa 1900-1910

Today, and everyday, we honor and remember the service members who gave their lives for their country. #MemorialDay Image: Mayor John F. Collins and others observe Memorial Day at the World War II memorial in the Back Bay Fens, May 30, 1960.

Check out the view of the Elevated Railway on Harrison Avenue near Motte Street #onthisday in 1901!