One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The first Protestant church in Arizona and only Gothic Revival style adobe church in the world.

This former factory has been transformed into a technicolor wonderland, where dozens of local artists have collaborated to create a real choose-your-own-adventure experience.

This Norman castle has been the scene of assassination plots, religious persecution, and Nazi conspiracies throughout its long history.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

This extraordinary Viking artifact has traveled throughout the city.

Thanks to a bit of wordplay, seven auspicious stone cats guard this ancient canalside street.

A large Melbourne wall is home to an iconic work of art from one of the world's most renowned street artists.

One New Hampshire alleyway has become home to a public gallery of feline art.