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

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A small "palace" and museum made of, and devoted entirely, to salt.

Foragers once flocked to this big beautiful bayou to hunt for pearls.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

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

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

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

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

In Paris, Texas they have their own Eiffel Tower, it just has a cowboy hat on it.

Witness to many historic moments in early Texas history.

A snapshot of the city's fascinating voodoo culture.

In the absence of a Chinese-language newspaper, for years the community posted daily updates on this simple bulletin board.

Seattle's super-sized cowboy apparel once belonged to a themed gas station that wrangled in herds of tourists.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

This historic hub for labor unions has survived the city's changing landscape.

The four tall pillars once marked the entrance of the historic Seattle church that fought for women's suffrage and civil rights.

The first park built over a freeway is a brutalist masterwork.

The only international border marker within the United States.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.