A mysterious stone embedded at the base of a historic Boston building.

Millions of numbers carved in glass represent the tattoos forced upon victims.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

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

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

The modest childhood home where the baseball legend and Yankees star learned to hit from both sides of the plate.

This historic theater's pipe organ still accompanies silent films just like it did in 1929.

This former mining town was named the most toxic town in America.

The iconic remains of the original Academic Hall that burned down in 1892.

Like Stonehenge, but with boats and oodles more charm.

A museum where visitors can learn about greyhounds and (more importantly) pet them.

A wonderful collection of all things Oz is nestled in the heart of Kansas.

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

The first home of the doomed aviator Amelia Earhart.

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

A remarkably opulent mansion with a tragic history.

A museum celebrating the Victorian obsession with hair art.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.