Exactly a month after a few dozen protesters set up an encampment on Wall Street, demonstrations have spread around the world to more than 900 cities in Europe, Africa, Asia, and North America.

Demonstrators affiliated with the Occupy Wall Street rally in New York's Times Square, Oct. 15. New York now appears to be just the tip of the iceberg. (Mary Altaffer/AP)

On Sunday, a fraction of protesters from the global day of occupation stayed on, determined to “occupy” their city until changes were made to the global financial and government systems.

In Washington, Sunday’s historic dedication of the Dr. Martin Luther King, Jr. National Memorial inspired some attendees to join in the protests, including Princeton professor Cornel West, who was arrested while demonstrating on the steps of the Supreme Court building against corporate influence over government.

The group Occupy Wall Street, which has now raised $300,000, said of the global demonstration: “United in one voice, we will let politicians, and the financial elites they serve, know it is up to us, the people, to decide our future.”

The following video was used by Occupy organizers to spur protests:

In interviews with protesters from around the world this weekend, one protester told the online magazine The Global Post: “The best possible outcome is that people of the world know that we can be one. This never happened before in the history of man.” Watch the Post’s video:

Filmmaker Jack Chute captured this video of the protests in London:

Several maps are tracking where protests are worldwide, including the following map by the magazine Mother Jones. (See the interactive version here.)

United For Global Change, one of the groups that organized Saturday’s protest, has a map that shows significantly more protests than estimated by others. (See the interactive version here.)

The Post has this map of where protesters have checked in on Foursquare around the U.S, and geographic technology Web site Esri has this map of the social media conversation.

Despite the spread of protests worldwide, demonstrators have still not settled on what many say will be a sticking point for the movement: a clear set of demands or list of desired policy changes.

The closest thing to that may be from Occupy Wall Street’s General Assembly, which the New York Times reports has a “Declaration of the Occupation of New York City” listing grievances against corporations.

For some, the declaration and general assembly are enough, but Shawn Redden, a history teacher and protestor, told the Times, “We absolutely need demands. Like Frederick Douglass said, ‘Power concedes nothing without a demand.’”

More photos from the protests:

Protesters march during an Occupy Toronto demonstration in Toronto on Oct. 15. (Brent Lewin/Bloomberg)