(NEXSTAR) -- It seems Americans are gearing up for a busy Memorial Day weekend, with travel expected to break a 20-year record, according to the latest forecasts. The majority of people are projected to hit the roads, fueled by gas prices that are expected to be the cheapest in years.

While we don't know exactly where those travelers are traveling, some of America's most beloved spots are preparing for an influx of visitors.

Several national parks say they're preparing for crowds to ring in the unofficial start of summer within their boundaries.

Zion National Park warned last week that visitors should expect heavy traffic, full parking, and long waits at the southern Utah site. Entrance stations may, at times, experience "intermittent, temporary closures," as well as "lengthy waits to board park shuttles."