The man pushing the current forecast is Harold Camping, an 89-year-old Christian fundamentalist radio host and co-founder of the Family Radio network, which broadcasts on dozens of stations across the country. His group has sponsored the end-of-the-world caravan and plastered cities, including Washington, with billboards and signs.

The unexpected and potentially rotten news that the world will end on May 21 rolled into the District on Thursday morning, plastered on a caravan of five recreational vehicles that parked near the Washington Monument.

“Have you heard the awesome news?” the side of the RVs asked, in big bold letters. “The End of the World is Almost Here!”

As if the message weren’t scary enough, the dozen or so occupants of the RVs — vanguard of a national campaign funded by a fundamentalist Christian radio network and fueled by bus ads and Internet buzz — wore highlighter-bright yellow shirts that said “Earthquake So Mighty, So Great.” They offered pedestrians handouts saying there was “ marvelous proof” that “Holy God will bring judgment day on May 21, 2011.”

The Rapture, they warned, is upon us.

A woman waved off the pamphlet: “Already have one.” A jogger ran right past. “No thanks,” said another. A tourist simply said, “No.” Many people said exactly nothing.

Although the District is apparently a tough audience for doomsday forecasts — despite the power here to make something like it happen — many Americans have been captivatedby the idea of the end of time since the country’s beginning. Some have even been so bold as to pick a date. William Miller, who spawned a 19th-century religious movement that remains visible today, is the most classic example: He created a nationwide stir when he predicted that Jesus would return and the world would end before March 21, 1844. (He was stood up.)

“In American history, you have always had a fascination with this stuff,” said Doug Weaver, professor of religion at Baylor University.

End Times, as the phenomenon is known, has spawned an economy that rivals the GDP of small countries. There have been scores of books, movies, video games and albums that revolve around Armageddon and the end of the world.

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