This experiment in the lifespan of seeds will take a century before it is complete.

The plants form a living library and laboratory for researchers and students at Michigan State University.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

There are owls with glowing eyes in Herald Square.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

The saddest little diner in New York.

The final resting place of a famous 19th-century murder victim whose identity is still a mystery.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Astounding collection of coin-operated games and automata.

Inside the Wayne County airport is an amazing collection of lights and sounds.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Prove you deserve to be fed by Kenny Shopsin.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A small structure built from used railroad ties honors the short term of America's 20th president.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Marie told fortunes from her small stand on the Boardwalk for decades, including to a young Bruce Springsteen who would busk outside her booth.