Useful sites when you just can not figure out how to spell supercalifragilisticexpialidocious. Other sites are useful when going through art and architecture collections or websites.

Merriam-Webster Online
3 dictionaries, thesaurus, Encyclopedia Britannica, daily crossword puzzle and more.

Oxford English Dictionary
"The definitive record of the English language"

CRIS links for More Dictionaries & Thesauri
Links to dictionaries, thesauri, and collections of dictionaries.

Antonym Finder and Synonym Thesaurus

The Getty’s Art and Architectural Thesaurus

The Getty’s Thesaurus of Geographic Names

The Getty’s Union List of Artist’s Names
Search Artists by name, role, and country.