With airfares to Europe on the rise, it looks as if Americans are planning to rediscover the good ol' USA this summer.

As a result, perhaps more Americans will use the opportunity to visit some of the country's landmarks, such as the Alamo and the Grand Canyon, that sometimes get overlooked.

Summer airfares to Europe have climbed about 11 percent compared with last summer, according to travel website Kayak, which attributes the jump to airlines trying to cash in on travelers visiting the London Olympics starting in July.

Data from online searches on Kayak show that U.S. travelers are planning more domestic trips this summer than in the past. For example, Kayak found that searches in January for flights to Los Angeles this summer jumped 22 percent compared with January 2011, while searches for Las Vegas rose 20 percent.

The growth in domestic travel may address a surprising national condition: Most American adults have not visited some of the nation's best-known landmarks.

For example, 72 percent of U.S. adults have never visited the Alamo, the site of a pivotal battle in the Texas revolution against Mexico, according to a nonscientific survey of more than 2,000 adults commissioned by the website Hotwire and conducted online by Harris Interactive.

According to the survey, 65 percent of American adults have yet to visit the Grand Canyon, 62 percent have not checked out the Statue of Liberty and 61 percent have never been to the Golden Gate Bridge.

More than half (57 percent) of adults in the United States have never visited the White House, the survey said.