These enigmatic ruins continue to vex archaeologists.

A flooded Mexican cave that hides a river beneath the water.

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.

Want to build a wind turbine? Secede from the nation.

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

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

This backwater graveyard in the Hamptons became a trendy burial spot and posthumous status symbol for famous artists.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

Nope, not Washington Irving's house.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

Historical figures from New York City's Catholic community reside in Midtown.

What was once the largest NFL stadium.

The world’s largest Masonic temple was saved by the White Stripes.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.