Ever wonder what that funky mansion down the street looks like on the inside? What about the corner bank that was built over a century ago? Or the city's oldest art academy?

On Saturday and Sunday, over 150 of the city's churches, museums, mansions and clubs have opened up their doors to the public -- free of charge -- as part of the Chicago Architecture Foundation's second annual Open House Chicago.

The citywide event offers a rare, behind-the-scenes look at some of the city's greatest spaces. No advance registration or reservations are required -- participants are urged to just show up.

Scroll down to peruse some of the participating sites or view the full list here.

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  • Casa Bonita

    7340-7350 N. Ridge Blvd. <br> Photo by David 23 <a href="http://www.flickr.com/photos/david23/6250581421/sizes/l/in/photostream/">via Flickr</a>.

  • Palette & Chisel Academy of Fine Art

    1012 N. Dearborn St.

  • Mayne Stage

    1328-30 W. Morse Ave.

  • Oriental Theatre

    24 W. Randolph St. <br> Photo by Proxy Indian <a href="http://www.flickr.com/photos/proxyindian/7342880894/sizes/l/in/photostream/">via Flickr</a>.

  • Casa Aztlan

    1831 S. Racine Ave. <br> <em>Photo by swanksalot <a href="http://www.flickr.com/photos/swanksalot/2737751303/sizes/l/in/photostream/">via Flickr</a>.</em>

  • Keith House

    1900 S. Prairie Ave. <br> Photo by ChicagoGeek <a href="http://www.flickr.com/photos/chicagogeek/5569940441/sizes/l/in/photostream/">via Flickr</a>.

  • Pui Tak Center

    2216 S. Wentworth Ave.

  • Driehaus Museum

    40 E. Erie St. <br> Photo by Chicago Geek <a href="http://www.flickr.com/photos/chicagogeek/4965400889/sizes/l/in/photostream/">via Flickr</a>.

  • International Museum of Surgical Science

    1524 N. Lake Shore Dr.

  • South Side Community Art Center

    3831 S. Michigan Ave.

  • Hyde Park Bank

    1525 E. 53rd St. <br> Photo by puroticorico <a href="http://www.flickr.com/photos/puroticorico/534145656/sizes/l/in/photostream/">via Flickr</a>.

  • Charnley-Persky House

    1365 N. Astor St. <br> Photo by veritatem <a href="http://www.flickr.com/photos/veritatem/3952767656/sizes/o/in/photostream/">via Flickr</a>.

  • Bronzeville Visitor Information Center

    3501 S. Martin Luther King Dr.

  • Humboldt Park Refectory & Fieldhouse

    1440 N. Sacramento Ave. <br> Photo by danxoneil <a href="http://www.flickr.com/photos/juggernautco/341677110/sizes/l/in/photostream/">via Flickr</a>.

  • South Shore Cultural Center

    7059 S. Shore Dr.

  • National Museum of Mexican Art

    1852 W. 19th St.

  • Bridgeview Bank

    4753 N. Broadway Ave. <br> Photo by alexdstewart32 <a href="http://www.flickr.com/photos/alexdstewart32/8004435279/sizes/l/in/photostream/">via Flickr</a>.

  • Agudas Achim North Shore Congregation

    5029 N. Kenmore Ave. <br> Photo by leah.jones <a href="http://www.flickr.com/photos/accidentallyjewish/3376356741/sizes/l/in/photostream/">via Flickr</a>.

  • Architechs

    2541 W. Division St.

  • Hyde Park Art Center

    5020 S. Cornell Ave.

  • Newberry Library

    60 W. Walton St.