The largest masonic lodge in Cuba.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The rogue roots are gradually consuming some of the historic marble grave markers.

Remnants of a wall built to separate Black residents of Hall's Hill from a newly built subdivision are a grim reminder of segregation in 20th-century Virginia.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The world's oldest soul food restaurant is also one of its best.

A historic arena where the Beatles played their first concert in the U.S.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The United States Capitol's former columns still stand.

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

This Underground station has been a popular filming location for decades, even before it closed.

A 1950s beatnik coffee house, turned 60s counterculture hotspot, turned modern music venue.