Can you believe that I have never been to a giant theme park before? You know, places like Six Flags, Universal Studios, or even Disneyland? I can only imagine what it would be like. Judging by what I have heard from people, they seem like miserable places to be. Especially when they are busy. There is nothing I love more than standing in line, in order to get in another line, so you can get a ticket for another line. Add sweltering heat, and I'm thinking I'll stick to my current plan of just NOT going.

Now, imagine the same scenario, but this time with wild animals and geysers instead of rollercoasters and a giant mouse. That is the current scene in Yellowstone National Park. Extreme flooding forced the entire park to close, but it appears that entrances on the south end of the park are beginning to re-open for tourist travel. At the height of the tourist season at Yellowstone National Park, it is clear there are lots of people eager to get into the park.

Watch aerial footage of a massive amount of traffic backed up at West Yellowstone.

The park has a system they are currently using to minimize the flow of traffic making its way into the park. Letting everyone in at one time could cause more problems than the park is already dealing with. Currently, the park is letting vehicles in based on their license plate numbers. Plates with odd numbers on their plates get in on odd days. Plates with even numbers get in on even days. Customized plates are allowed in on odd days and motorcycles are allowed in on even days.

LOOK: Stunning vintage photos capture the beauty of America's national parks

Today these parks are located throughout the country in 25 states and the U.S. Virgin Islands. The land encompassing them was either purchased or donated, though much of it had been inhabited by native people for thousands of years before the founding of the United States. These areas are protected and revered as educational resources about the natural world, and as spaces for exploration.

Keep scrolling for 50 vintage photos that show the beauty of America's national parks.

LOOK: Oldest Disneyland Rides From 1955 to Today

Stacker, set out to compile a definitive list of every Disneyland attraction you can enjoy today and ranked them by their age. Using real-time data from Touring Plans, Disney archives, and historical news releases and reviews, our list starts with exciting recent park additions and stretches back to the oldest opening-day classics. This list focuses on the original Disneyland Park, so you will not see any rides from its neighboring California Adventure located just across the promenade. Read on to discover the oldest Disneyland rides you can still ride today.