This parking garage was the site of what was - at the time - the largest cash robbery in history.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

This memorial honors those who served on Gallops Island Radio Training Station during the second World War.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This impressive Boston holy house is the American mecca for Christian scientists.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

An enormous, inside-out glass globe built in 1935.

The oldest playground in America.

The 1920s child prodigy author was last seen here at her Brookline home before vanishing at age 25.

This Dutch-styled residential building was originally a cocoa company's World's Fair showpiece.

Two thousand artifacts from around the world collected by one woman who loved to travel.

One of the now-less-hidden floral gems of the "Emerald Necklace."

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

A men’s restroom became a sandwich shop.

Statue commemorating the use of ether in anesthesia.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The world's largest piece of copyrighted artwork.

This train station inspired the name of a 1970's rock band and provided the backdrop for their album cover.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

A small, red building located along a state highway where the 18th Vice President made shoes in his youth.