Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

Mural fragments and various sculptures honor the longtime artist.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Detroit’s Eastern Market has been transformed into an outdoor museum with colorful murals that address social issues and symbolize the city.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Enormous small-business mecca in the Midwest, serving dozens of artists.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

This sprawling bookstore spans four floors and has more than a million books in stock.

At 130 years old and 126 feet tall, it is the largest known example of the rare Torrey pine tree.

Explore more than 130,000 new and used books in the "world's largest outdoor bookstore."

Showing films since the silent era of the 1920s, it is now the last movie house in downtown Newport.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

A place steeped in history that may be best known as the set of a 1960 film.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Built between 1901 and 1908, this building is one of the most iconic examples of modernist architecture in Spain.

Stunning Roman aqueduct used for 1900 years and still standing.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.