This 15-foot origami pteranodon, folded out of one sheet of paper, is one of the exhibits at the Redpath Museum. Many of Montreal-s museums are open for free Sunday as part of the annual Montreal Museums Day

MONTREAL -- Sunday is the 21st edition of Montreal Museums Day.

We asked our friends at participating museums for a fun fact, an important anecdote or let them toot their own horn -- why not? They deserve it -- it's their day.

Happy Museums Day! Here's what we got.

The Stewart Hall Art Gallery house has been a private estate and a seminary with a working farm that had imported Italian marble -- on the floor of the barn.

Famous visitors to the Montreal Biodome include Angelina Jolie and C.R.A.Z.Y.'s Marc-André Grondin. In fact, the Biodome should hit the 14 million visitor mark this July.

The Montreal Planetarium is the only French planetarium in North America. Harrison Ford once paid a visit.

The Redpath Museum is the first in the world to acquire a giant origami pteranodon made by artist Robert Lang. The life-size cretaceous flying reptile was crafted from a single sheet of handmade paper measuring 15-by-15 feet. It took one week to fold.

Start praying! Sunday is your last chance to admire the oldest catechisms and school books printed in Quebec, in French, English and Native languages at the Grande Bibliotheque.

Need some Montreal history from 1635 until today? Centre d'histoire de Montreal is the place for you.

Benjamin Franklin was sent to Canada by the Continental Congress of Philadelphia in 1776 to persuade the Canadians to join the American Revolution. While in Montreal, he was invited to the Chateau Ramezay for a reception. After an unsuccessful 10-day stay in Canada, Franklin declared, "it would be easier to buy Canada than conquer it."

Montreal Holocaust Memorial Centre Museum is the only Holocaust museum in Canada. After World War II, Montreal became home to the third-largest Holocaust survivor community. Survivors will share their stories on Museums Day.

The Stewart Museum initiated the first military living history program in Quebec with the reconstitution of two 18th-century regiments.

Carole Bouquet, Pierce Brosnan, Michel Blanc, Diane Dufresne, Ethan Hawke, Angelina Jolie, Harvey Keitel, Pierre Lapointe, Vanessa Paradis and Richard Séguin have all visited Musee d'Art Contemporain.

At Hotel Dieu de Montreal, the city's oldest Hospital, you can see countless objects documenting medicine and the health system in Montreal from the 17th century on, including a document signed by Louis the XIV, a collection of reliquaries, a pill machine and ancient surgical tools.

The Montreal Science Centre won two Awards of Excellence from the Société des musées québécois (SMQ) for its Autopsy of a Murder and X-Treme Rotation exhibitions.

Built in the 17th century, Maison St. Gabriel is one of the oldest houses in Montreal. On Sunday visitors can watch demonstrations by a master carpenter and a spoonmaker, learn the art of weaving baskets and discover the art of making arrowhead sashes.

The bad news is the Fortin Museum in Old Montreal has closed. The good news is that the collection has moved to the Musem of Fine Arts.

If you can't visit in person, you can still visit online. The virtual McCord Museum celebrates the 10th anniversary of its Web site.

Pointe-à-Callière just turned 15 years old. Its weekend event ­-- Sweet Stories, Montreal Delicacies -- includes an archeological cake and full size carousel.

The Biosphere just installed a pair of working wind turbines, similar to models that could supply energy to your own home.

Did you know that Ecomusee du Fier Monde, a museum devoted to working-class history, is housed in a former public bath?

Musee des Maitres et Artisans du Quebec offers Hands of Masters, a new exhibit of some 350 artistic objects made by master craftsmen.

This summer, Sir George Etienne Cartier National Historic Site dishes the dirt with a live theatrical presentation called Montreal: Magnificent and Miserable, Confessions of a 19th-century Servant.

The Fur Trade at Lachine National Historic Site has a soft spot for some hard-working souls called voyageurs, men who were hired to transport furs and goods. The Web site says they would paddle their canoes 14 to 16 hours every day.

Marguerite Bourgeoys Museum is not only a working chapel, but a working archaeological site as well.

The Canadian Centre for Architecture collection contains a wealth and variety of materials, but one of the more curious objects is a #10 paper envelope containing artist/architect Gordon Matta-Clark's hair.

Finally, Do Not Adjust Your Set, a look at vintage televisions, and Forms in Movement, a look at animation, both at Cinematheque Quebecoise, are two of the best free exhibits in town.

Montreal Museums Day is Sunday. Most museums open 9 a.m. to 6 p.m. Admission is free. Due to the transit strike, the usual free shuttle service is not available. Museum links, addresses and phone numbers available at or call (877) 266-5687.

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