This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A Manhattan tombstone honors a popular 19th-century heroine, now long forgotten.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

The house where Robert E. Lee planned the Battle of Antietam is said to be haunted by the ghost of a Civil War soldier.

The house where John Wilkes Booth conspired with his co-conspirators.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

There’s a special club house at the top for the bell ringers.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A natural spring situated on the grounds of the Hawthorne estate.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This rudder is one of the few remnants of a shipyard that once operated on the banks of the Potomac River.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

Situated in a bustling intersection, this "mobile" monument that honors local veterans from five different wars has moved several times but appears to have found its final resting place.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This enormous photomural pays homage to Vancouver's infamous history of public activism.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

What happens when a sculptor has to find a way around a 100-year-old copyright.

This quirky piece of naval artillery has been deafening Canadians for over a century.

The ruins of Vancouver's abandoned heritage railway.

This exaggerated sculpture resembles a well known feature of Vancouver:

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.