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."

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A 1914 beaux arts auditorium that sat shuttered for 20 years, restored and reopened in 2026

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

Early prototype for Frank Lloyd Wright's Guggenheim.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

From Japan to Italy, this California park explores the world's cultures through their gardens.

This private residence was the template for one of the most beloved television homes of all time.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.