ROADSIDE ATTRACTIONS

Roadside America.com
Online guide to offbeat tourist attractions. Over 2,000 pages of "interstate adventure". Attractions can be located by state, by category, or by recommended week-long excursions.
http://www.roadsideamerica.com/

EccentricAmerica.net
Bringing the eccentricities of roadside America to the Web. Giant donuts, world's largest thermometer and drive through trees are just a few of the oddities you can see from your car (or simply by visiting this website).
http://www.eccentricamerica.net/

RoadsidePeek.com
Dedicated to preserving the bizarre in signs and architecture of commercial America. Also features separate search categories to find that unique oddity along your route.
http://www.roadsidepeek.com/