Million Dollar Theater - Los Angeles, California

307 South Broadway - Sid Grauman's Million Dollar Theater opened in 1918.  The building was designed by Albert C. Martin, Sr. with the exterior decorative elements by sculptor Joseph Mora.  I haven't been in the actual theater (designed by William Woollett) but you can find a couple of pictures on the theater's website.  The Los Angeles Conservancy offers a theater tour (among other historic tours) that can include interiors of some theaters.

Los Angeles City Hall - Los Angeles, California

200 North Spring Street - The 1928 City Hall is instantly recognizable from movies and TV shows such as Dragnet.