The "Sultan of Swat" once attended a school at the site of this baseball field.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

This decrepit abandoned building is made all the more eerie by its dark history.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

This large granite seal outside a Massachusetts funeral home comes with a surprising dedication.

Once the largest gravity dam in the world.

A castle on a hill once named "the most beautiful high school in Massachusetts."

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

Located in Faneuil Hall, the headquarters of the Ancient and Honorable Artillery Company of Massachusetts has stood the test of time.

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

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

An eccentric inventor's castle home with its own indoor weather system.