This pole near the infield rail at Belmont Park marks the jaw-dropping margin of Secretariat’s 1973 Belmont Stakes victory.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

A fire station-turned-church-turned-museum dedicated to the work of seminal light artist Dan Flavin.

A mysterious air force base built to resemble a Long Island fishing village.

Etchings in a pile of boulders on the Long Island Sound are a monument to vanquished native peoples.

A large camera obscura, constructed entirely from digitally fabricated components.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

An unrealized dream to wirelessly electrify the entire Earth.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

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

There’s a hidden military meme engraved on the World War II Memorial.

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

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The world's oldest continuously operating airport was founded by the Wright Brothers.

This WWII plane died a quiet death, and is now a garden eel playground.

This airstrip atoll is uninhabited by humans, but absolutely full of birds.

The world's largest aggregation of great white sharks is at a mysterious spot in the middle of the ocean.

An alternate history park where the Union Army loses the war... to dinosaurs.