Built hundreds of years ago this downtown iron barrier once protected a much despised king.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The rare American Civil War-era weapon was never fired in anger.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

I fought the law and the precinct caved in.

This slender three-story building has also had several famous residents.

New York City's smallest piece of private property.

A shining, cold, black organ lies in San Francisco's financial district.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

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

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

A motel dedicated to Southwestern nostalgia.

Legends surround this jagged rock formation in the New Mexico desert.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

This historic national park is covered in the stunning ruins of red rock pueblos.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Visible below the waves are memorials to the city's Gold Rush dead.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."