WASHINGTON -- The $450-million, seven-level Newseum, which is being billed as the world's most interactive museum, will open in the nations capital on April 11.

In its 250,000 square feet of exhibit space the Newseum will offer visitors 15 theaters, 14 major galleries, 2 broadcast studios and a 4-D time-travel experience.

The building features a glass-fronted "window on the world" facing Pennsylvania Avenue and a 74-foot-high, 50-ton marble tablet emblazoned with the 45 words of the First Amendment to the U.S. Constitution.

"This museum is a unique blend of fun and inspiration," said Charles L. Overby, museum CEO. "There is something for everyone here - history, games, films, big screens, photos and major historical artifacts from around the world."

The opening April 11 will include a live broadcast of a portion of ABCs "Good Morning America" from the museum and free admission for the public that day. Special activities will continue throughout opening weekend, including musical entertainment, photo opportunities, historical actors, guest appearances, and games and activities for children and families.

Event details are being posted at www.newseum.org.

"The Newseum will be a must-see in D.C. from opening day on," said Newseum Executive Director Joe Urschel. "Visitors will be transported through time from the dawn of the age of the printed word to the cutting edge of the digital age through an unparalleled blend of artifacts, photography, exhibits, films and interactive experiences."

Beginning April 12, the Newseum will be open from 9 a.m. to 5 p.m. daily and closed on Thanksgiving, Christmas and New Years Day. Admission will be $20 for adults (13 to 64), $18 for seniors (65 and older) and $13 for youth (7 to 12). Children under 7 will be admitted free.

Discounts will be available for groups. Tickets may be purchased online at www.newseum.org, by telephone at (888) 639-7386, or in person at the Newseum admissions desk (beginning April 12).

In partnership with the Newseum, The Washington Post is sponsoring free admission for group tours of school children from the District of Columbia, 8 counties in Maryland and 11 Virginia cities and counties for the first year of the museums operation.

The Newseum's 14 major galleries tell the story of news and highlight historic and contemporary First Amendment issues. The Berlin Wall Gallery includes eight sections of the original wall and a 40-foot guard tower originally located less than a mile from Checkpoint Charlie.

The Pulitzer Prize Photographs Gallery encompasses photographs from every winning entry dating to 1942, as well as a 19-minute documentary with interviews from more than a dozen prize-winning photojournalists. The Time Warner World News Gallery provides an overview of global news and includes a 36-foot-wide map illustrating the state of press freedom in 193 countries.

The largest gallery is the 8,000-square-foot News Corporation News History Gallery, which features more than 350 historic newspaper front pages, newsbooks and magazines that span nearly 500 years and artifacts such as a hotel door from the Watergate burglary and the script from the first "60 Minutes" broadcast.

Technological innovations include the 7,000-square-foot NBC News Interactive Newsroom, where visitors may select any of 48 interactive kiosks or experiences and immerse themselves in the many roles - photojournalist, editor, reporter, anchor - required to bring the news to the public. Throughout the museum are more than 130 interactive stations featuring more than two dozen experiences.

The museum's 15 theaters include the 535-seat Walter and Leonore Annenberg Theater, where the Newseum will present an original 4-D feature that takes visitors on a time-travel experience through three news events spanning more than 150 years. The 13-minute film's 3-D effects (visitors wear special glasses) are combined with environmental effects - motion, air gusts, water and more. In all, more than 100 original videos were created for Newseum visitors.

The Newseum in Washington, D.C., was more than six years in planning, design and construction. It was made possible by a commitment of $450 million from the Freedom Forum, a nonpartisan foundation.

The building, located between the White House and the U.S. Capitol on Pennsylvania, offers views of the Capitol and the National Mall from its terraces. The 90-foot atrium features a 40-by-22-foot media screen where breaking news, historic news events and documentaries will be shown.

The building includes a food court, a museum retail store, more than 140,000 square feet of residential apartments and a three-level restaurant - The Source by Wolfgang Puck.