Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked memorial honoring the local Washington residents who died in World War I.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The remnants of a facade from a 19th-century market stall emporium.

This grave marks one of few bodies retrieved from the disastrous Franklin Arctic expedition.

This mundane post marks the old location of the city's main postal hub.

A roadway designed for a visiting monarch.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Brass bricks outline the locations of Edinburgh's lost, lively market stalls.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Now home to a drinking establishment, this building has a macabre history.

This Scottish graveyard is the final resting place of the man who inspired the character Ebenezer Scrooge.

A British plaque explains that a house was built using the spoils of the first international golf bet.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

An idle pastime becomes a record holder in Boys Town, Nebraska.

An Englishman loses his scalp to a Cheyenne warrior and lives to donate it to a library.

An obelisk commemorating Lincoln's role in connecting the coasts.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A series of three shiny letters mark the boundary of an old refuge for those being pursued by debt collectors.

Wisconsin's most celebrated export gets the royal treatment on I-94.