If a day goes by that I don’t get a question about one of these sites, it’s a very slow day.
Those questions tell me something else: Students have genuine interests in geography, and in mysteries. Students will pay attention to lesson plans that include one or more of these sites in them, especially if you refer to the mystery.
How about just a geography search: How close is the closest site to you? Can students visit these sites on their summer vacations? What airport is closest for tourists? What arrangements need to be made to visit the place?
Wired.com provides the video — your students have the questions. Can you provide the answers, or lead them to the answers? How about listing your answers in comments?
Answers, or more information:
- Racetrack Playa’s mystery moving rocks, from Geology.com; or, see this suggestion from Brian Dunning, or this one from USGS
- Marfa Lights: AstronomyCafe.com says they are reflected auto headlights; whatever they are, Marfa hosts a festival over Labor Day weekend
Millard Fillmore's Bathtub 
Marfa, Texas. See photos and more, here:
http://www.marfacc.com/
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http://www.roadsideamerica.com/ Has a lot of information about niche sites all over the US.
http://www.forteantimes.com/ Is all about all kinds of weirdness, but not really much geography. Still, useful.
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Whats Marfa? never heard of that
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