Doors Open Ontario returns for its 10th year, starting with Guelph today (April 30).

“This season, participants will have the opportunity to explore iconic landmarks, natural wonders, architectural gems and hidden heritage treasures at 56 community events across the province,” says Liane Nowosielski of the Ontario Heritage Trust.

There are seven new destinations: Deseronto-Napanee; Grimsby; Highlands East; Kapuskasing; Middlesex; Merrickville; and Pickering.

Brantford and Brant County are featured on Sept. 24th.

Here are the upcoming Doors Open events (most are from 10 a.m. to 4 p.m.):

– Guelph, April 30; Chatham-Kent, Whitby, May 7; Hamilton, May 7-8; Temiskaming Shores, May 14; Deseronto-Napanee and Milton, May 28; and Brockville-Thousand Islands and Toronto, May 28-29.

– Whitchurch-Stouffville, June 4; Huronia, Ottawa and Owen Sound, June 4-5; Smiths Falls, June 5; Clarington and Richmond Hill, June 11; Burlington and Highlands East, June 11-12; Kingston and Perth, June 18; Fergus-Elora, June 25; and Muskoka, June 25-26.

– Aurora, July 9; Kapuskasing, July 23; Norfolk, Aug. 13; Georgina and Markham, Aug. 27; Belleville, Sept. 10; Cornwall-Seaway Valley, Sept. 10-11; Kawartha Lakes, Sept. 11; Amherstburg, Haldimand County, Newmarket, Rideau Lakes-Westport, St. Marys and Waterloo Region, Sept. 17.

– London, Middlesex and South Bruce Peninsula, Sept. 17-18; Merrickville, Sept. 18; and Brant, East Elgin, Oxford County and Pembroke, Sept. 24.

– Grimsby, Oakville, Oshawa and Peterborough, Sept. 24-25; Barrie, Mississauga, Pickering and Port Stanley-Sparta, Oct. 1; Gananoque, St. Thomas and Vaughan, Oct. 1-2; and Kincardine, Oct. 15-16.

To learn more about the Doors Open Ontario events and sites: visit the website at www.doorsopenontario.on.ca; or call 1-800-ONTARIO and request the Doors Open Ontario booklet.