As the fourth-most populated city in the United States, Houston is not usually considered a tourist destination. However, whether it's your first time as a tourist or your many-times,  there are still many awesome theme parks, fascinating historical spots, and spectacular destinations from natural wonders to NASA.

Here are some interesting facts about Houston:

• Population estimate for the Houston Brazoria Galveston Consolidated Metropolitan Statistical Area is 4,253,428; ranking it 10th among the nation's metropolitan areas.

• Houston is reportedly the most air-conditioned place on the earth. The climate is classified as marine or semi-tropical. The average temperature in Houston is a delightful 70 degrees year-round

• The 52-mile man-made Houston Ship Channel connects Houston to the Gulf of Mexico, allowing Houston to be an inland city and a seaport at the same time

• The Port of Houston is the second-largest port in the United States in total and foreign tonnage. It ranks eighth worldwide

• Major Industries - where cotton was once king, now Houston relies on the energy, petrochemical, medical and space industries

• Home to NASA Johnson Space Center, focal point for U.S. manned space flight program

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Houston's "Firsts"

• "Houston" was the first word Astronaut Neil Armstrong spoke when he landed on the moon.

• It's home to the first major freeway in Texas.

• America's first public television station is located her