Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

A disastrous D-Day rehearsal was relatively unknown until this sunken tank was discovered 40 years later.

A former Nazi lookout tower with a magnificent view of the Rhineland.

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

Curtiss is a forgotten figure in the early history of flight.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A vast personal collection of World War II artifacts unearthed over many years by a father-son duo.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

During WWII the U.S. Navy conducted primitive drone strikes on this Lake Michigan lighthouse.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

This one-room cabin where the young colonel slept during the French and Indian War.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A memorial in coal country commemorates the victims of an all-too-preventable mining disaster.

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

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

The cave where two British judges hid in exile after sentencing the king to death.