A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

"Prepare yourself! You are to become the voice of Interplanetary Parliament."

A Romanesque sanctuary of calm amid the bustle of downtown Los Angeles.

This "City of Books" holds a museum, library, and the complete personal book collections of five of Mexico's greatest thinkers.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

A museum dedicated to the history and exploration of both popular music and science fiction.

A toxic ghost town sitting atop a massive coal fire.

The "Kill Bill Church" was transformed into a place of worship after a long Hollywood history.

The beautiful baroque library of the Hapsburg empire.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This massive library holds what was once the largest book collection in the world.

The attic of a four-century-old canal house hides a clandestine church.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The illuminating collection of L.A. street lights is run by the city and only opens one day per month.