This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

Inside this church is an obscure piece of art carved by the famous Alice Liddell.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This grand gothic brewery has been pumping out suds for over a hundred years.

The most decorated dog of World War I is preserved in the Smithsonian.

Home to items never before seen by the public.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

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

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

The FBI's urban training course may have the highest fake crime rate in the world.