To visit museums on the web look through the links on the Art/Art history page.

This is a regularly updated directory of, and information resource site for, cultural arts and events. Site contents include:

The Calendar, which offers the largest selection of performing arts
                     performance schedules online, in a simple, user-friendly format. You
                     can search for arts information on a city-by-city basis, by date, or
                     performance type. Their Calendar now includes full season schedules
                     for over 900 arts organizations in the U.S. and Canada, and is
                     growing every day.
 

City Guides, which offers guides to cultural events in major cities in North America.
 

Tribune, which is a news page for the arts.
 

Resources, which provides information on topics such as Broadway, summer arts festivals, classical music, dance, opera, etc.; interviews with and biographies of performing artists; a dictionary of the performing arts; and so on.

Culture Fun, which includes culture quizes and message boards. Gossip about
                      your favorite Diva, ask questions about your favorite pieces,
                      or recommend recordings to other CultureFinder readers!
                      With message boards on twenty-nine different topics, you're
                      sure to find a board that suits your interests.

Truly the most comprehensive directory and search engine for the arts. Categories at this site under which you can search include:
 
  Artist Index
  Art Galleries
  Art Museums
  Art Exhibitions
  Art For Sale 
  Commercial Arts
  Arts Publications
  Schedules
  Art Schools
  Arts Agencies
  Children Resources
  Art History
  Film Resources
  Literary Resources
  Theatre Resources
  Dance Resources
  Antiques
  Crafts

The site also features things such as:
  Chat Forum
  Message Forum
  Arts Events