The site of the deadly Triangle Shirtwaist Factory Fire.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

An unassuming secret door once led to a legendary watering hole.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

A dilapidated dock tells the story of Titanic's missed arrival.

Elevated freight railway turned wildly successful urban park.

Built in 1512, the oldest cathedral in the Americas.

Historic home of a Black veteran of the American Revolution and one of the earliest civil rights activists in the United States.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

Mobsters came for a soak in the hot springs, and stayed for the illegal gambling and bootlegging.

Also known as the Founding Church of Scientology.

The house where John Wilkes Booth conspired with his co-conspirators.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This oversized flute-playing Ancestral Puebloan deity is also a landmark of Southwestern kitsch.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

A striking lighthouse with views of the Gulf of Mexico and of a military air show.

In the hills of southern Indiana is the idyllic studio and museum of legendary artist T.C. Steele.