Internet Math Hunt 
Grades: 9-12
Ongoing? Yes
Every month brings with it a Math scavenger hunt in which students compete to find answers to questions such as: What mathematical relationship did Stradivari use to place the F-holes on his violins? and What is Cartesian geometry and for whom is it named?

ML King Scavenger Hunt
Grades: 3-8
This site is a biography of sorts about Martin Luther King. It is an Internet scavenger hunt that asks questions about him throughout his lifetime and provides links to pages where the answers can be found. In some instances, clever hints are provided. The last two questions of the scavenger hunt are more involved, asking students to write poems, songs, or essays to be published online or asking them to attend a Martin Luther King celebration and submit an online review. There is also a teacher’s section with a PowerPoint presentation and paraphernalia for creating bulletin boards and other displays about Martin Luther King.

Scholastic's Math Hunt 
Grades: 5-8
A kid-friendly interface and a wide selection of topics make this activity appealing. Students select a topic (such as "human body"),then are presented mathematical multiple choice questions using the selected topic as a context (e.g., How much time does a kidney patient spend on dialysis weekly?). Students peruse pre-selected websites to find the answer to the question, select their choice, and are given feedback on their correct or incorrect response. Besides reinforcing mathematic principles,this is a good way to introduce students to the art of online navigation.

The Underground Railroad
Grades: 7-12
Students research selected websites and answer open-ended and short-answer questions about the Underground Railroad. Primary sources such as census records and personal narratives give students a first-hand look at theimpact of the Underground Railroad.